n players are going to play a rock-paper-scissors tournament. As you probably know, in a one-on-one match of rock-paper-scissors, two players choose their shapes independently. The outcome is then determined depending on the chosen shapes: "paper" beats "rock", "rock" beats "scissors", "scissors" beat "paper", and two equal shapes result in a draw.

At the start of the tournament all players will stand in a row, with their numbers increasing from 1 for the leftmost player, to n for the rightmost player. Each player has a pre-chosen shape that they will use in every game throughout the tournament. Here's how the tournament is conducted:

  * If there is only one player left, he is declared the champion.
  * Otherwise, two adjacent players in the row are chosen arbitrarily, and they play the next match. The losing player is eliminated from the tournament and leaves his place in the row (with his former neighbours becoming adjacent). If the game is a draw, the losing player is determined by a coin toss.

The organizers are informed about all players' favoured shapes. They wish to find out the total number of players who have a chance of becoming the tournament champion (that is, there is a suitable way to choose the order of the games and manipulate the coin tosses). However, some players are still optimizing their strategy, and can inform the organizers about their new shapes. Can you find the number of possible champions after each such request?

Input

The first line contains two integers n and q — the number of players and requests respectively (1 ≤ n ≤ 2 ⋅ 10^5, 0 ≤ q ≤ 2 ⋅ 10^5).

The second line contains a string of n characters. The i-th of these characters is "R", "P", or "S" if the player i was going to play "rock", "paper", or "scissors" before all requests respectively.

The following q lines describe the requests. The j-th of these lines contain an integer p_j and a character c_j meaning that the player p_j is going to use the shape described by the character c_j from this moment (1 ≤ p_j ≤ n).

Output

Print q + 1 integers r_0, …, r_q, where r_k is the number of possible champions after processing k requests.

Example

Input

3 5
RPS
1 S
2 R
3 P
1 P
2 P

Output

2
2
1
2
2
3


Lunar New Year is approaching, and Bob decides to take a wander in a nearby park.

The park can be represented as a connected graph with n nodes and m bidirectional edges. Initially Bob is at the node 1 and he records 1 on his notebook. He can wander from one node to another through those bidirectional edges. Whenever he visits a node not recorded on his notebook, he records it. After he visits all nodes at least once, he stops wandering, thus finally a permutation of nodes a_1, a_2, …, a_n is recorded.

Wandering is a boring thing, but solving problems is fascinating. Bob wants to know the lexicographically smallest sequence of nodes he can record while wandering. Bob thinks this problem is trivial, and he wants you to solve it.

A sequence x is lexicographically smaller than a sequence y if and only if one of the following holds:

  * x is a prefix of y, but x ≠ y (this is impossible in this problem as all considered sequences have the same length);
  * in the first position where x and y differ, the sequence x has a smaller element than the corresponding element in y.

Input

The first line contains two positive integers n and m (1 ≤ n, m ≤ 10^5), denoting the number of nodes and edges, respectively.

The following m lines describe the bidirectional edges in the graph. The i-th of these lines contains two integers u_i and v_i (1 ≤ u_i, v_i ≤ n), representing the nodes the i-th edge connects.

Note that the graph can have multiple edges connecting the same two nodes and self-loops. It is guaranteed that the graph is connected.

Output

Output a line containing the lexicographically smallest sequence a_1, a_2, …, a_n Bob can record.

Examples

Input

3 2
1 2
1 3

Output

1 2 3

Input

5 5
1 4
3 4
5 4
3 2
1 5

Output

1 4 3 2 5

Input

10 10
1 4
6 8
2 5
3 7
9 4
5 6
3 4
8 10
8 9
1 10

Output

1 4 3 7 9 8 6 5 2 10

Note

In the first sample, Bob's optimal wandering path could be 1 → 2 → 1 → 3. Therefore, Bob will obtain the sequence \{1, 2, 3\}, which is the lexicographically smallest one.

In the second sample, Bob's optimal wandering path could be 1 → 4 → 3 → 2 → 3 → 4 → 1 → 5. Therefore, Bob will obtain the sequence \{1, 4, 3, 2, 5\}, which is the lexicographically smallest one.


You are a coach at your local university. There are n students under your supervision, the programming skill of the i-th student is a_i.

You have to form k teams for yet another new programming competition. As you know, the more students are involved in competition the more probable the victory of your university is! So you have to form no more than k (and at least one) non-empty teams so that the total number of students in them is maximized. But you also know that each team should be balanced. It means that the programming skill of each pair of students in each team should differ by no more than 5. Teams are independent from one another (it means that the difference between programming skills of two students from two different teams does not matter).

It is possible that some students not be included in any team at all.

Your task is to report the maximum possible total number of students in no more than k (and at least one) non-empty balanced teams.

If you are Python programmer, consider using PyPy instead of Python when you submit your code.

Input

The first line of the input contains two integers n and k (1 ≤ k ≤ n ≤ 5000) — the number of students and the maximum number of teams, correspondingly.

The second line of the input contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ 10^9), where a_i is a programming skill of the i-th student.

Output

Print one integer — the maximum possible total number of students in no more than k (and at least one) non-empty balanced teams.

Examples

Input

5 2
1 2 15 15 15

Output

5

Input

6 1
36 4 1 25 9 16

Output

2

Input

4 4
1 10 100 1000

Output

4


You are given a sequence a_1, a_2, ..., a_n consisting of n integers.

You can choose any non-negative integer D (i.e. D ≥ 0), and for each a_i you can:

  * add D (only once), i. e. perform a_i := a_i + D, or
  * subtract D (only once), i. e. perform a_i := a_i - D, or
  * leave the value of a_i unchanged.

It is possible that after an operation the value a_i becomes negative.

Your goal is to choose such minimum non-negative integer D and perform changes in such a way, that all a_i are equal (i.e. a_1=a_2=...=a_n).

Print the required D or, if it is impossible to choose such value D, print -1.

For example, for array [2, 8] the value D=3 is minimum possible because you can obtain the array [5, 5] if you will add D to 2 and subtract D from 8. And for array [1, 4, 7, 7] the value D=3 is also minimum possible. You can add it to 1 and subtract it from 7 and obtain the array [4, 4, 4, 4].

Input

The first line of the input contains one integer n (1 ≤ n ≤ 100) — the number of elements in a.

The second line of the input contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ 100) — the sequence a.

Output

Print one integer — the minimum non-negative integer value D such that if you add this value to some a_i, subtract this value from some a_i and leave some a_i without changes, all obtained values become equal.

If it is impossible to choose such value D, print -1.

Examples

Input

6
1 4 4 7 4 1

Output

3

Input

5
2 2 5 2 5

Output

3

Input

4
1 3 3 7

Output

-1

Input

2
2 8

Output

3


You are given array a_1, a_2, ..., a_n. You need to split it into k subsegments (so every element is included in exactly one subsegment).

The weight of a subsegment a_l, a_{l+1}, ..., a_r is equal to (r - l + 1) ⋅ max_{l ≤ i ≤ r}(a_i). The weight of a partition is a total weight of all its segments.

Find the partition of minimal weight.

Input

The first line contains two integers n and k (1 ≤ n ≤ 2 ⋅ 10^4, 1 ≤ k ≤ min(100, n)) — the length of the array a and the number of subsegments in the partition.

The second line contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ 2 ⋅ 10^4) — the array a.

Output

Print single integer — the minimal weight among all possible partitions.

Examples

Input

4 2
6 1 7 4

Output

25

Input

4 3
6 1 7 4

Output

21

Input

5 4
5 1 5 1 5

Output

21

Note

The optimal partition in the first example is next: 6 1 7 \bigg| 4.

The optimal partition in the second example is next: 6 \bigg| 1 \bigg| 7 4.

One of the optimal partitions in the third example is next: 5 \bigg| 1 5 \bigg| 1 \bigg| 5.


Today Adilbek is taking his probability theory test. Unfortunately, when Adilbek arrived at the university, there had already been a long queue of students wanting to take the same test. Adilbek has estimated that he will be able to start the test only T seconds after coming.

Fortunately, Adilbek can spend time without revising any boring theorems or formulas. He has an app on this smartphone which contains n Japanese crosswords to solve. Adilbek has decided to solve them all one by one in the order they are listed in the app, without skipping any crossword. For each crossword, a number t_i is given that represents the time it takes an average crossword expert to solve this crossword (the time is given in seconds).

Adilbek is a true crossword expert, but, unfortunately, he is sometimes unlucky in choosing the way to solve the crossword. So, it takes him either t_i seconds or t_i + 1 seconds to solve the i-th crossword, equiprobably (with probability 1/2 he solves the crossword in exactly t_i seconds, and with probability 1/2 he has to spend an additional second to finish the crossword). All these events are independent.

After T seconds pass (or after solving the last crossword, if he manages to do it in less than T seconds), Adilbek closes the app (if he finishes some crossword at the same moment, that crossword is considered solved; otherwise Adilbek does not finish solving the current crossword at all). He thinks it would be an interesting probability theory problem to calculate E — the expected number of crosswords he will be able to solve completely. Can you calculate it?

Recall that the expected value of a discrete random variable is the probability-weighted average of all possible values — in this problem it means that the expected value of the number of solved crosswords can be calculated as E = ∑ _{i = 0}^{n} i p_i, where p_i is the probability that Adilbek will solve exactly i crosswords.

We can represent E as rational fraction P/Q with Q > 0. To give the answer, you should print P ⋅ Q^{-1} mod (10^9 + 7).

Input

The first line contains two integers n and T (1 ≤ n ≤ 2 ⋅ 10^5, 1 ≤ T ≤ 2 ⋅ 10^{14}) — the number of crosswords and the time Adilbek has to spend, respectively.

The second line contains n integers t_1, t_2, ..., t_n (1 ≤ t_i ≤ 10^9), where t_i is the time it takes a crossword expert to solve the i-th crossword.

Note that Adilbek solves the crosswords in the order they are given in the input without skipping any of them.

Output

Print one integer — the expected value of the number of crosswords Adilbek solves in T seconds, expressed in the form of P ⋅ Q^{-1} mod (10^9 + 7).

Examples

Input

3 5
2 2 2

Output

750000007

Input

3 5
2 1 2

Output

125000003

Note

The answer for the first sample is equal to 14/8.

The answer for the second sample is equal to 17/8.


Summer in Berland lasts n days, the price of one portion of ice cream on the i-th day is c_i. Over the summer, Tanya wants to eat exactly k portions of ice cream. At the same time, on the i-th day, she decided that she would eat at least a_i portions, but not more than b_i (a_i ≤ b_i) portions. In other words, let d_i be equal to the number of portions that she eats on the i-th day. Then d_1+d_2+...+d_n=k and a_i ≤ d_i ≤ b_i for each i.

Given that portions of ice cream can only be eaten on the day of purchase, find the minimum amount of money that Tanya can spend on ice cream in the summer.

Input

The first line contains two integers n and k (1 ≤ n ≤ 2⋅10^5, 0 ≤ k ≤ 10^9) — the number of days and the total number of servings of ice cream that Tanya will eat in the summer.

The following n lines contain descriptions of the days, one description per line. Each description consists of three integers a_i, b_i, c_i (0 ≤ a_i ≤ b_i ≤ 10^9, 1 ≤ c_i ≤ 10^6).

Output

Print the minimum amount of money that Tanya can spend on ice cream in the summer. If there is no way for Tanya to buy and satisfy all the requirements, then print -1.

Examples

Input

3 7
3 5 6
0 3 4
3 3 3

Output

31

Input

1 45000
40000 50000 100000

Output

4500000000

Input

3 100
2 10 50
50 60 16
20 21 25

Output

-1

Input

4 12
2 5 1
1 2 2
2 3 7
3 10 4

Output

35

Note

In the first example, Tanya needs to eat 3 portions of ice cream on the first day, 1 portions of ice cream on the second day and 3 portions of ice cream on the third day. In this case, the amount of money spent is 3⋅6+1⋅4+3⋅3=31. It can be shown that any other valid way to eat exactly 7 portions of ice cream costs more.


The only difference between easy and hard versions are constraints on n and k.

You are messaging in one of the popular social networks via your smartphone. Your smartphone can show at most k most recent conversations with your friends. Initially, the screen is empty (i.e. the number of displayed conversations equals 0).

Each conversation is between you and some of your friends. There is at most one conversation with any of your friends. So each conversation is uniquely defined by your friend.

You (suddenly!) have the ability to see the future. You know that during the day you will receive n messages, the i-th message will be received from the friend with ID id_i (1 ≤ id_i ≤ 10^9).

If you receive a message from id_i in the conversation which is currently displayed on the smartphone then nothing happens: the conversations of the screen do not change and do not change their order, you read the message and continue waiting for new messages.

Otherwise (i.e. if there is no conversation with id_i on the screen):

  * Firstly, if the number of conversations displayed on the screen is k, the last conversation (which has the position k) is removed from the screen.
  * Now the number of conversations on the screen is guaranteed to be less than k and the conversation with the friend id_i is not displayed on the screen.
  * The conversation with the friend id_i appears on the first (the topmost) position on the screen and all the other displayed conversations are shifted one position down.

Your task is to find the list of conversations (in the order they are displayed on the screen) after processing all n messages.

Input

The first line of the input contains two integers n and k (1 ≤ n, k ≤ 200) — the number of messages and the number of conversations your smartphone can show.

The second line of the input contains n integers id_1, id_2, ..., id_n (1 ≤ id_i ≤ 10^9), where id_i is the ID of the friend which sends you the i-th message.

Output

In the first line of the output print one integer m (1 ≤ m ≤ min(n, k)) — the number of conversations shown after receiving all n messages.

In the second line print m integers ids_1, ids_2, ..., ids_m, where ids_i should be equal to the ID of the friend corresponding to the conversation displayed on the position i after receiving all n messages.

Examples

Input

7 2
1 2 3 2 1 3 2

Output

2
2 1

Input

10 4
2 3 3 1 1 2 1 2 3 3

Output

3
1 3 2

Note

In the first example the list of conversations will change in the following way (in order from the first to last message):

  * [];
  * [1];
  * [2, 1];
  * [3, 2];
  * [3, 2];
  * [1, 3];
  * [1, 3];
  * [2, 1].

In the second example the list of conversations will change in the following way:

  * [];
  * [2];
  * [3, 2];
  * [3, 2];
  * [1, 3, 2];
  * and then the list will not change till the end.


There are N cities in the country of Numbata, numbered from 1 to N. Currently, there is no road connecting them. Therefore, each of these N cities proposes a road candidate to be constructed.

City i likes to connect with city A_i, so city i proposes to add a direct bidirectional road connecting city i and city A_i. It is guaranteed that no two cities like to connect with each other. In other words, there is no pair of integers i and j where A_i = j and A_j = i. It is also guaranteed that any pair of cities are connected by a sequence of road proposals. In other words, if all proposed roads are constructed, then any pair of cities are connected by a sequence of constructed road.

City i also prefers the road to be constructed using a specific material. Each material can be represented by an integer (for example, 0 for asphalt, 1 for wood, etc.). The material that can be used for the road connecting city i and city A_i is represented by an array B_i containing M_i integers: [(B_i)_1, (B_i)_2, ..., (B_i)_{M_i}]. This means that the road connecting city i and city A_i can be constructed with either of the material in B_i.

There are K workers to construct the roads. Each worker is only familiar with one material, thus can only construct a road with a specific material. In particular, the i^{th} worker can only construct a road with material C_i. Each worker can only construct at most one road. You want to assign each worker to construct a road such that any pair of cities are connected by a sequence of constructed road.

Input

Input begins with a line containing two integers: N K (3 ≤ N ≤ 2000; 1 ≤ K ≤ 2000) representing the number of cities and the number of workers, respectively. The next N lines each contains several integers: A_i M_i (B_i)_1, (B_i)_2, ⋅⋅⋅, (B_i)_{M_i} (1 ≤ A_i ≤ N; A_i ≠ i; 1 ≤ M_i ≤ 10 000; 0 ≤ (B_i)_1 < (B_i)_2 < ... < (B_i)_{M_i} ≤ 10^9) representing the bidirectional road that city i likes to construct. It is guaranteed that the sum of M_i does not exceed 10 000. It is also guaranteed that no two cities like to connect with each other and any pair of cities are connected by a sequence of road proposals. The next line contains K integers: C_i (0 ≤ C_i ≤ 10^9) representing the material that is familiarized by the workers.

Output

If it is not possible to assign each worker to construct a road such that any pair of cities are connected by a sequence of constructed road, simply output -1 in a line. Otherwise, for each worker in the same order as input, output in a line two integers (separated by a single space): u and v in any order. This means that the worker constructs a direct bidirectional road connecting city u and v. If the worker does not construct any road, output "0 0" (without quotes) instead. Each pair of cities can only be assigned to at most one worker. You may output any assignment as long as any pair of cities are connected by a sequence of constructed road.

Examples

Input

4 5
2 2 1 2
3 2 2 3
4 2 3 4
2 2 4 5
1 2 3 4 5

Output

1 2
2 3
3 4
0 0
4 2

Input

4 5
2 2 10 20
3 2 2 3
4 2 3 4
2 2 4 5
1 2 3 4 5

Output

-1

Note

Explanation for the sample input/output #1

We can assign the workers to construct the following roads:

  * The first worker constructs a road connecting city 1 and city 2.
  * The second worker constructs a road connecting city 2 and city 3.
  * The third worker constructs a road connecting city 3 and city 4.
  * The fourth worker does not construct any road.
  * The fifth worker constructs a road connecting city 4 and city 2.

Therefore, any pair of cities are now connected by a sequence of constructed road.

Explanation for the sample input/output #2

There is no worker that can construct a road connecting city 1, thus city 1 is certainly isolated.


There are four stones on an infinite line in integer coordinates a_1, a_2, a_3, a_4. The goal is to have the stones in coordinates b_1, b_2, b_3, b_4. The order of the stones does not matter, that is, a stone from any position a_i can end up in at any position b_j, provided there is a required number of stones in each position (that is, if a coordinate x appears k times among numbers b_1, …, b_4, there should be exactly k stones at x in the end).

We are allowed to move stones with the following operation: choose two stones at distinct positions x and y with at least one stone each, and move one stone from x to 2y - x. In other words, the operation moves a stone to a symmetric position relative to some other stone. At any moment it is allowed to have any number of stones at the same position.

Find any sequence of operations that achieves the goal, or determine that it is impossible. The sequence does not have to be shortest, but it may contain at most 1000 operations.

Input

The first line contains four integers a_1, …, a_4 (-10^9 ≤ a_i ≤ 10^9) — initial coordinates of the stones. There may be multiple stones sharing the same coordinate.

The second line contains four integers b_1, …, b_4 (-10^9 ≤ b_i ≤ 10^9) — target coordinates of the stones. There may be multiple targets sharing the same coordinate.

Output

If there is no sequence of operations that achieves the goal, print a single integer -1. Otherwise, on the first line print a single integer k (0 ≤ k ≤ 1000) — the number of operations in your sequence. On the next k lines, describe the operations. The i-th of these lines should contain two integers x_i and y_i (x_i ≠ y_i) — coordinates of the moved stone and the center of symmetry stone for the i-th operation.

For each operation i, there should at least one stone in each of the coordinates x_i and y_i, and the resulting coordinate 2y_i - x_i must not exceed 10^{18} by absolute value.

If there are multiple suitable sequences, print any of them. It is guaranteed that if there is a suitable sequence of operations, then there is also a suitable sequence that satisfies all the additional requirement.

Examples

Input

0 1 2 3
3 5 6 8

Output

3
1 3
2 5
0 3

Input

0 0 0 0
1 1 1 1

Output

-1

Input

0 0 0 1
0 1 0 1

Output

-1


This is a hard version of the problem. The actual problems are different, but the easy version is almost a subtask of the hard version. Note that the constraints and the output format are different.

You are given a string s consisting of n lowercase Latin letters.

You have to color all its characters the minimum number of colors (each character to exactly one color, the same letters can be colored the same or different colors, i.e. you can choose exactly one color for each index in s).

After coloring, you can swap any two neighboring characters of the string that are colored different colors. You can perform such an operation arbitrary (possibly, zero) number of times.

The goal is to make the string sorted, i.e. all characters should be in alphabetical order.

Your task is to find the minimum number of colors which you have to color the given string in so that after coloring it can become sorted by some sequence of swaps. Note that you have to restore only coloring, not the sequence of swaps.

Input

The first line of the input contains one integer n (1 ≤ n ≤ 2 ⋅ 10^5) — the length of s.

The second line of the input contains the string s consisting of exactly n lowercase Latin letters.

Output

In the first line print one integer res (1 ≤ res ≤ n) — the minimum number of colors in which you have to color the given string so that after coloring it can become sorted by some sequence of swaps.

In the second line print any possible coloring that can be used to sort the string using some sequence of swaps described in the problem statement. The coloring is the array c of length n, where 1 ≤ c_i ≤ res and c_i means the color of the i-th character.

Examples

Input

9
abacbecfd

Output

2
1 1 2 1 2 1 2 1 2

Input

8
aaabbcbb

Output

2
1 2 1 2 1 2 1 1

Input

7
abcdedc

Output

3
1 1 1 1 1 2 3

Input

5
abcde

Output

1
1 1 1 1 1


How many stars are there in the sky? A young programmer Polycarpus can't get this question out of his head! He took a photo of the starry sky using his digital camera and now he analyzes the resulting monochrome digital picture. The picture is represented by a rectangular matrix consisting of n lines each containing m characters. A character equals '1', if the corresponding photo pixel is white and '0', if it is black.

Polycarpus thinks that he has found a star on the photo if he finds a white pixel surrounded by four side-neighboring pixels that are also white:

     1
    111
     1

a star on the photo

Polycarpus whats to cut out a rectangular area from the photo and give his mom as a present. This area should contain no less than k stars. The stars can intersect, have shared white pixels on the photo. The boy will cut out the rectangular area so that its borders will be parallel to the sides of the photo and the cuts will go straight between the pixel borders.

Now Polycarpus keeps wondering how many ways there are to cut an area out of the photo so that it met the conditions given above. Help Polycarpus find this number.

Input

The first line of the input data contains three integers n, m and k (1 ≤ n, m ≤ 500;1 ≤ k ≤ nm). Then follow n lines, containing the description of the given photo as a sequence of lines. Each line contains m characters '0' or '1'.

Output

Print the required number of areas on the given photo.

Examples

Input

4 6 2
111000
111100
011011
000111

Output

6

Input

5 5 4
11111
11111
11111
11111
11111

Output

9

Note

We'll number the rows and columns below starting from 1, the coordinates (p, q) will denote a cell in row p, column q.

In the first sample Polycarpus should cut out any area containing a rectangle whose opposite corners lie in cells (1, 1) and (3, 4). Only rectangles with opposite corners in (1, 1) and (x, y), where x ≥ 3 and y ≥ 4 fit the conditions.

In the second sample any rectangle whose each side is no less than four, will do. The possible rectangle sizes are 4 × 4, 4 × 5, 5 × 4 and 5 × 5. Such figures can be cut in 4 ways, 2 ways, 2 ways and 1 way correspondingly.

Please do not use the %lld specificator to read or write 64-bit integers in C++. It is preferred to use cin, cout streams or the %I64d specificator.


You have an array a of length n. For every positive integer x you are going to perform the following operation during the x-th second:

  * Select some distinct indices i_{1}, i_{2}, …, i_{k} which are between 1 and n inclusive, and add 2^{x-1} to each corresponding position of a. Formally, a_{i_{j}} := a_{i_{j}} + 2^{x-1} for j = 1, 2, …, k. Note that you are allowed to not select any indices at all.

You have to make a nondecreasing as fast as possible. Find the smallest number T such that you can make the array nondecreasing after at most T seconds.

Array a is nondecreasing if and only if a_{1} ≤ a_{2} ≤ … ≤ a_{n}.

You have to answer t independent test cases.

Input

The first line contains a single integer t (1 ≤ t ≤ 10^{4}) — the number of test cases.

The first line of each test case contains single integer n (1 ≤ n ≤ 10^{5}) — the length of array a. It is guaranteed that the sum of values of n over all test cases in the input does not exceed 10^{5}.

The second line of each test case contains n integers a_{1}, a_{2}, …, a_{n} (-10^{9} ≤ a_{i} ≤ 10^{9}).

Output

For each test case, print the minimum number of seconds in which you can make a nondecreasing.

Example

Input

3
4
1 7 6 5
5
1 2 3 4 5
2
0 -4

Output

2
0
3

Note

In the first test case, if you select indices 3, 4 at the 1-st second and 4 at the 2-nd second, then a will become [1, 7, 7, 8]. There are some other possible ways to make a nondecreasing in 2 seconds, but you can't do it faster.

In the second test case, a is already nondecreasing, so answer is 0.

In the third test case, if you do nothing at first 2 seconds and select index 2 at the 3-rd second, a will become [0, 0].


You are given four positive integers n, m, a, b (1 ≤ b ≤ n ≤ 50; 1 ≤ a ≤ m ≤ 50). Find any such rectangular matrix of size n × m that satisfies all of the following conditions:

  * each row of the matrix contains exactly a ones;
  * each column of the matrix contains exactly b ones;
  * all other elements are zeros.

If the desired matrix does not exist, indicate this.

For example, for n=3, m=6, a=2, b=1, there exists a matrix satisfying the conditions above:

$$$ \begin{vmatrix} 0 & 1 & 0 & 0 & 0 & 1 \\\ 1 & 0 & 0 & 1 & 0 & 0 \\\ 0 & 0 & 1 & 0 & 1 & 0 \end{vmatrix} $$$

Input

The first line contains an integer t (1 ≤ t ≤ 1000) — the number of test cases. Then t test cases follow.

Each test case is described by four positive integers n, m, a, b (1 ≤ b ≤ n ≤ 50; 1 ≤ a ≤ m ≤ 50), where n and m are the sizes of the matrix, and a and b are the number of ones for rows and columns, respectively.

Output

For each test case print:

  * "YES" (without quotes) and the required matrix (if there are several answers, print any) if it exists, or
  * "NO" (without quotes) if it does not exist.

To print the matrix n × m, print n rows, each of which consists of m numbers 0 or 1 describing a row of the matrix. Numbers must be printed without spaces.

Example

Input

5
3 6 2 1
2 2 2 1
2 2 2 2
4 4 2 2
2 1 1 2

Output

YES
010001
100100
001010
NO
YES
11
11
YES
1100
1100
0011
0011
YES
1
1


This is the easy version of the problem. The difference between the versions is the constraint on n and the required number of operations. You can make hacks only if all versions of the problem are solved.

There are two binary strings a and b of length n (a binary string is a string consisting of symbols 0 and 1). In an operation, you select a prefix of a, and simultaneously invert the bits in the prefix (0 changes to 1 and 1 changes to 0) and reverse the order of the bits in the prefix.

For example, if a=001011 and you select the prefix of length 3, it becomes 011011. Then if you select the entire string, it becomes 001001.

Your task is to transform the string a into b in at most 3n operations. It can be proved that it is always possible.

Input

The first line contains a single integer t (1≤ t≤ 1000) — the number of test cases. Next 3t lines contain descriptions of test cases.

The first line of each test case contains a single integer n (1≤ n≤ 1000) — the length of the binary strings.

The next two lines contain two binary strings a and b of length n.

It is guaranteed that the sum of n across all test cases does not exceed 1000.

Output

For each test case, output an integer k (0≤ k≤ 3n), followed by k integers p_1,…,p_k (1≤ p_i≤ n). Here k is the number of operations you use and p_i is the length of the prefix you flip in the i-th operation.

Example

Input

5
2
01
10
5
01011
11100
2
01
01
10
0110011011
1000110100
1
0
1

Output

3 1 2 1
6 5 2 5 3 1 2
0
9 4 1 2 10 4 1 2 1 5
1 1

Note

In the first test case, we have 01→ 11→ 00→ 10.

In the second test case, we have 01011→ 00101→ 11101→ 01000→ 10100→ 00100→ 11100.

In the third test case, the strings are already the same. Another solution is to flip the prefix of length 2, which will leave a unchanged.


We have a point A with coordinate x = n on OX-axis. We'd like to find an integer point B (also on OX-axis), such that the absolute difference between the distance from O to B and the distance from A to B is equal to k.

<image> The description of the first test case.

Since sometimes it's impossible to find such point B, we can, in one step, increase or decrease the coordinate of A by 1. What is the minimum number of steps we should do to make such point B exist?

Input

The first line contains one integer t (1 ≤ t ≤ 6000) — the number of test cases.

The only line of each test case contains two integers n and k (0 ≤ n, k ≤ 10^6) — the initial position of point A and desirable absolute difference.

Output

For each test case, print the minimum number of steps to make point B exist.

Example

Input

6
4 0
5 8
0 1000000
0 0
1 0
1000000 1000000

Output

0
3
1000000
0
1
0

Note

In the first test case (picture above), if we set the coordinate of B as 2 then the absolute difference will be equal to |(2 - 0) - (4 - 2)| = 0 and we don't have to move A. So the answer is 0.

In the second test case, we can increase the coordinate of A by 3 and set the coordinate of B as 0 or 8. The absolute difference will be equal to |8 - 0| = 8, so the answer is 3.

<image>


John has Q closed intervals of consecutive 2K-bit numbers [l_i, r_i] and one 16-bit value v_i for each interval. (0 ≤ i < Q)

John wants to implement a function F that maps 2K-bit numbers to 16-bit numbers in such a way that inputs from each interval are mapped to that interval's value. In other words: $$$F(x) = v_i, \; for every  0 ≤ i < Q \; , and every  x ∈ [l_i, r_i]$$$ The output of F for other inputs is unimportant.

John wants to make his implementation of F fast so he has decided to use lookup tables. A single 2K-bit lookup table would be too large to fit in memory, so instead John plans to use two K-bit lookup tables, LSBTable and MSBTable. His implementation will look like this: $$$ F(x) = LSBTable[lowKBits(x)] \; \& \; MSBTable[highKBits(x)]$$$ In other words it returns the "bitwise and" of results of looking up the K least significant bits in LSBTable and the K most significant bits in MSBTable.

John needs your help. Given K, Q and Q intervals [l_i, r_i] and values v_i, find any two lookup tables which can implement F or report that such tables don't exist.

Input

The first line contains two integers K and Q ( 1 <= K <= 16, 1 <= Q <= 2⋅ 10^5).

Each of the next Q lines contains three integers l_i, r_i and v_i. ( 0 ≤ l_i ≤ r_i < 2^{2K}, 0 ≤ v_i < 2^{16}).

Output

On the first line output "possible" (without quotes) if two tables satisfying the conditions exist, or "impossible" (without quotes) if they don't exist.

If a solution exists, in the next 2 ⋅ 2^K lines your program should output all values of the two lookup tables (LSBTable and MSBTable) it found. When there are multiple pairs of tables satisfying the conditions, your program may output any such pair.

On lines 1 + i output LSBTable[i]. (0 ≤ i < 2^K, 0 ≤ LSBTable[i] < 2^{16}).

On lines 1 + 2^K + i output MSBTable[i]. (0 ≤ i < 2^K, 0 ≤ MSBTable[i] < 2^{16}).

Examples

Input

1 2
0 2 1
3 3 3

Output

possible
1
3
1
3

Input

2 4
4 5 3
6 7 2
0 3 0
12 13 1

Output

possible
3
3
2
2
0
3
0
1

Input

2 3
4 4 3
5 6 2
12 14 1

Output

impossible

Note

A closed interval [a, b] includes both a and b.

In the first sample, tables LSBTable = [1,3] and MSBTable = [1,3] satisfy the conditions: F[0] = LSBTable[0] \& MSBTable[0] = 1 \& 1 = 1, F[1] = LSBTable[1] \& MSBTable[0] = 3 \& 1 = 1, F[2] = LSBTable[0] \& MSBTable[1] = 1 \& 3 = 1, F[3] = LSBTable[1] \& MSBTable[1] = 3 \& 3 = 3.

In the second sample, tables LSBTable = [3,3,2,2] and MSBTable = [0,3,0,1] satisfy all the conditions.

In the third sample there are no two lookup tables which can satisfy the conditions.


You are given an array a of length 2n. Consider a partition of array a into two subsequences p and q of length n each (each element of array a should be in exactly one subsequence: either in p or in q).

Let's sort p in non-decreasing order, and q in non-increasing order, we can denote the sorted versions by x and y, respectively. Then the cost of a partition is defined as f(p, q) = ∑_{i = 1}^n |x_i - y_i|.

Find the sum of f(p, q) over all correct partitions of array a. Since the answer might be too big, print its remainder modulo 998244353.

Input

The first line contains a single integer n (1 ≤ n ≤ 150 000).

The second line contains 2n integers a_1, a_2, …, a_{2n} (1 ≤ a_i ≤ 10^9) — elements of array a.

Output

Print one integer — the answer to the problem, modulo 998244353.

Examples

Input

1
1 4

Output

6

Input

2
2 1 2 1

Output

12

Input

3
2 2 2 2 2 2

Output

0

Input

5
13 8 35 94 9284 34 54 69 123 846

Output

2588544

Note

Two partitions of an array are considered different if the sets of indices of elements included in the subsequence p are different.

In the first example, there are two correct partitions of the array a:

  1. p = [1], q = [4], then x = [1], y = [4], f(p, q) = |1 - 4| = 3;
  2. p = [4], q = [1], then x = [4], y = [1], f(p, q) = |4 - 1| = 3.

In the second example, there are six valid partitions of the array a:

  1. p = [2, 1], q = [2, 1] (elements with indices 1 and 2 in the original array are selected in the subsequence p);
  2. p = [2, 2], q = [1, 1];
  3. p = [2, 1], q = [1, 2] (elements with indices 1 and 4 are selected in the subsequence p);
  4. p = [1, 2], q = [2, 1];
  5. p = [1, 1], q = [2, 2];
  6. p = [2, 1], q = [2, 1] (elements with indices 3 and 4 are selected in the subsequence p).


Petya loves lucky numbers very much. Everybody knows that lucky numbers are positive integers whose decimal record contains only the lucky digits 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not.

Petya loves long lucky numbers very much. He is interested in the minimum lucky number d that meets some condition. Let cnt(x) be the number of occurrences of number x in number d as a substring. For example, if d = 747747, then cnt(4) = 2, cnt(7) = 4, cnt(47) = 2, cnt(74) = 2. Petya wants the following condition to fulfil simultaneously: cnt(4) = a1, cnt(7) = a2, cnt(47) = a3, cnt(74) = a4. Petya is not interested in the occurrences of other numbers. Help him cope with this task.

Input

The single line contains four integers a1, a2, a3 and a4 (1 ≤ a1, a2, a3, a4 ≤ 106).

Output

On the single line print without leading zeroes the answer to the problem — the minimum lucky number d such, that cnt(4) = a1, cnt(7) = a2, cnt(47) = a3, cnt(74) = a4. If such number does not exist, print the single number "-1" (without the quotes).

Examples

Input

2 2 1 1

Output

4774

Input

4 7 3 1

Output

-1


There are n squares drawn from left to right on the floor. The i-th square has three integers p_i,a_i,b_i, written on it. The sequence p_1,p_2,...,p_n forms a permutation.

Each round you will start from the leftmost square 1 and jump to the right. If you are now on the i-th square, you can do one of the following two operations:

  1. Jump to the i+1-th square and pay the cost a_i. If i=n, then you can end the round and pay the cost a_i.
  2. Jump to the j-th square and pay the cost b_i, where j is the leftmost square that satisfies j > i, p_j > p_i. If there is no such j then you can end the round and pay the cost b_i.

There are q rounds in the game. To make the game more difficult, you need to maintain a square set S (initially it is empty). You must pass through these squares during the round (other squares can also be passed through). The square set S for the i-th round is obtained by adding or removing a square from the square set for the (i-1)-th round.

For each round find the minimum cost you should pay to end it.

Input

The first line contains two integers n, q (1≤ n,q≤ 2 ⋅ 10^5) — the number of squares and the number of rounds.

The second line contains n distinct integers p_1,p_2,...,p_n (1≤ p_i≤ n). It is guaranteed that the sequence p_1,p_2,...,p_n forms a permutation.

The third line contains n integers a_1,a_2,…,a_n (-10^9≤ a_i≤ 10^9).

The fourth line contains n integers b_1,b_2,...,b_n (-10^9≤ b_i≤ 10^9).

Then q lines follow, i-th of them contains a single integer x_i (1≤ x_i≤ n). If x_i was in the set S on the (i-1)-th round you should remove it, otherwise, you should add it.

Output

Print q lines, each of them should contain a single integer — the minimum cost you should pay to end the corresponding round.

Examples

Input

3 2
2 1 3
10 -5 4
3 -2 3
1
2

Output

6
8

Input

5 4
2 1 5 3 4
6 -5 3 -10 -1
0 3 2 7 2
1
2
3
2

Output

-8
-7
-7
-8

Note

Let's consider the character T as the end of a round. Then we can draw two graphs for the first and the second test.

<image> <image>

In the first round of the first test, the set that you must pass through is \{1\}. The path you can use is 1→ 3→ T and its cost is 6.

In the second round of the first test, the set that you must pass through is \{1,2\}. The path you can use is 1→ 2→ 3→ T and its cost is 8.


Polycarp is an organizer of a Berland ICPC regional event. There are n universities in Berland numbered from 1 to n. Polycarp knows all competitive programmers in the region. There are n students: the i-th student is enrolled at a university u_i and has a programming skill s_i.

Polycarp has to decide on the rules now. In particular, the number of members in the team.

Polycarp knows that if he chooses the size of the team to be some integer k, each university will send their k strongest (with the highest programming skill s) students in the first team, the next k strongest students in the second team and so on. If there are fewer than k students left, then the team can't be formed. Note that there might be universities that send zero teams.

The strength of the region is the total skill of the members of all present teams. If there are no teams present, then the strength is 0.

Help Polycarp to find the strength of the region for each choice of k from 1 to n.

Input

The first line contains a single integer t (1 ≤ t ≤ 1000) — the number of testcases.

The first line of each testcase contains a single integer n (1 ≤ n ≤ 2 ⋅ 10^5) — the number of universities and the number of students.

The second line of each testcase contains n integers u_1, u_2, ..., u_n (1 ≤ u_i ≤ n) — the university the i-th student is enrolled at.

The third line of each testcase contains n integers s_1, s_2, ..., s_n (1 ≤ s_i ≤ 10^9) — the programming skill of the i-th student.

The sum of n over all testcases doesn't exceed 2 ⋅ 10^5.

Output

For each testcase print n integers: the strength of the region — the total skill of the members of the present teams — for each choice of team size k.

Example

Input

4
7
1 2 1 2 1 2 1
6 8 3 1 5 1 5
10
1 1 1 2 2 2 2 3 3 3
3435 3014 2241 2233 2893 2102 2286 2175 1961 2567
6
3 3 3 3 3 3
5 9 6 7 9 7
1
1
3083

Output

29 28 26 19 0 0 0
24907 20705 22805 9514 0 0 0 0 0 0
43 43 43 32 38 43
3083

Note

In the first testcase the teams from each university for each k are:

  * k=1:
    * university 1: [6], [5], [5], [3];
    * university 2: [8], [1], [1];
  * k=2:
    * university 1: [6, 5], [5, 3];
    * university 2: [8, 1];
  * k=3:
    * university 1: [6, 5, 5];
    * university 2: [8, 1, 1];
  * k=4:
    * university 1: [6, 5, 5, 3];


AquaMoon has n friends. They stand in a row from left to right, and the i-th friend from the left wears a T-shirt with a number a_i written on it. Each friend has a direction (left or right). In the beginning, the direction of each friend is right.

AquaMoon can make some operations on friends. On each operation, AquaMoon can choose two adjacent friends and swap their positions. After each operation, the direction of both chosen friends will also be flipped: left to right and vice versa.

AquaMoon hopes that after some operations, the numbers written on the T-shirt of n friends in the row, read from left to right, become non-decreasing. Also she wants, that all friends will have a direction of right at the end. Please find if it is possible.

Input

The input consists of multiple test cases. The first line contains a single integer t (1 ≤ t ≤ 50) — the number of test cases.

The first line of each test case contains a single integer n (1 ≤ n ≤ 10^5) — the number of Aquamoon's friends.

The second line contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ 10^5) — the numbers, written on the T-shirts.

It is guaranteed that the sum of n for all test cases does not exceed 10^5.

Output

For each test case, if there exists a possible sequence of operations, print "YES" (without quotes); otherwise, print "NO" (without quotes).

You can print each letter in any case (upper or lower).

Example

Input

3
4
4 3 2 5
4
3 3 2 2
5
1 2 3 5 4

Output

YES
YES
NO

Note

The possible list of operations in the first test case:

  1. Swap a_1 and a_2. The resulting sequence is 3, 4, 2, 5. The directions are: left, left, right, right.
  2. Swap a_2 and a_3. The resulting sequence is 3, 2, 4, 5. The directions are: left, left, right, right.
  3. Swap a_1 and a_2. The resulting sequence is 2, 3, 4, 5. The directions are: right, right, right, right.


The Trinitarian kingdom has exactly n = 3k cities. All of them are located on the shores of river Trissisipi, which flows through the whole kingdom. Some of the cities are located on one side of the river, and all the rest are on the other side.

Some cities are connected by bridges built between them. Each bridge connects two cities that are located on the opposite sides of the river. Between any two cities exists no more than one bridge.

The recently inaugurated King Tristan the Third is busy distributing his deputies among cities. In total there are k deputies and the king wants to commission each of them to control exactly three cities. However, no deputy can be entrusted to manage the cities, which are connected by a bridge — the deputy can set a too high fee for travelling over the bridge to benefit his pocket, which is bad for the reputation of the king.

Help King Tristan the Third distribute the deputies between the cities, if it is possible.

Input

The first line contains two integers n and m — the number of cities and bridges (3 ≤ n < 105, n = 3k, 0 ≤ m ≤ 105). Next m lines describe the bridges. The i-th line contains two integers ai and bi — the numbers of cities that are connected by the i-th bridge (1 ≤ ai, bi ≤ n, ai ≠ bi, 1 ≤ i ≤ m).

It is guaranteed that no bridge connects a city with itself and that any two cities are connected with no more than one bridge.

Output

If distributing the deputies in the required manner is impossible, print in a single line "NO" (without the quotes).

Otherwise, in the first line print "YES" (without the quotes), and in the second line print which deputy should be put in charge of each city. The i-th number should represent the number of the deputy (from 1 to k), who should be in charge of city numbered i-th in the input — overall there should be n numbers.

If there are multiple solutions, print any of them.

Examples

Input

6 6
1 2
4 1
3 5
6 5
2 6
4 6

Output

YES
1 2 1 2 2 1

Input

3 1
1 2

Output

NO


John Doe has a list of all Fibonacci numbers modulo 1013. This list is infinite, it starts with numbers 0 and 1. Each number in the list, apart from the first two, is a sum of previous two modulo 1013. That is, John's list is made from the Fibonacci numbers' list by replacing each number there by the remainder when divided by 1013.

John got interested in number f (0 ≤ f < 1013) and now wants to find its first occurrence in the list given above. Help John and find the number of the first occurence of number f in the list or otherwise state that number f does not occur in the list.

The numeration in John's list starts from zero. There, the 0-th position is the number 0, the 1-st position is the number 1, the 2-nd position is the number 1, the 3-rd position is the number 2, the 4-th position is the number 3 and so on. Thus, the beginning of the list looks like this: 0, 1, 1, 2, 3, 5, 8, 13, 21, ...

Input

The first line contains the single integer f (0 ≤ f < 1013) — the number, which position in the list we should find.

Please, do not use the %lld specifier to read or write 64-bit integers in С++. It is preferred to use the cin, cout streams or the %I64d specifier.

Output

Print a single number — the number of the first occurrence of the given number in John's list. If this number doesn't occur in John's list, print -1.

Examples

Input

13

Output

7

Input

377

Output

14


Professor Bajtocy is conducting experiments on alien DNA. He has discovered that it is subject to repetitive mutations — each mutation happens in the same way: some continuous subsequence of the alien DNA becomes active, copies itself, the copy gets mangled and inserts itself right after the original subsequence. The mangled copy of the activated continuous subsequence is formed by first joining all the elements at the even positions in that subsequence, and then joining all the elements at the odd ones at the end. That is, if the activated subsequence consists of 11 elements and represented as s1s2... s11, its mangled copy is s2s4s6s8s10s1s3s5s7s9s11.

For example, if the original sequence was "ACTGG" and the mutation happened on the segment [2, 4] (that is the activated subsequence is "CTG"), the mutated DNA is: "ACTGTCGG". The mangled copy of the activated subsequence is marked with bold font.

Professor Bajtocy has written down the original DNA sequence and the mutations that sequentially happened to it, and he now asks you to recover the first k elements of the DNA sequence after all the mutations.

Input

The first line of input contains the original DNA sequence, consisting only of letters "A", "C", "T" and "G" and not exceeding 3·106 in length.

The second line contains a single integer k (1 ≤ k ≤ 3·106).

The third line contains a single integer n (0 ≤ n ≤ 5000) — the number of mutations. The next n lines describe the mutations in chronological order — each mutation is described by two numbers li and ri (1 ≤ li ≤ ri ≤ 109), meaning that the continuous subsequence [li, ri] has become active and cloned itself, joining itself with the mangled copy.

It is guaranteed that the input data is correct, that is, no mutation acts on non-existing elements of the DNA sequence, and the resulting DNA sequence has at least k elements.

Assume that the DNA elements are indexed starting from 1 and that the notation [l, r] meaning the continuous subsequence of DNA sequence that consists of r - l + 1 elements starting at the l-th DNA sequence element and ending at the r-th DNA sequence element.

Output

Output a single line, containing the first k letters of the mutated DNA sequence.

Examples

Input

GAGA
4
0

Output

GAGA

Input

ACGTACGT
16
2
1 2
2 8

Output

ACCAGTACCGACATCG

Note

In the second example, after the first mutation the sequence is "ACCAGTACGT". After the second mutation it's "ACCAGTACCGACATCGT".


You have a sequence of n distinct integers a1, a2, ..., an (1 ≤ ai ≤ n). You want to remove some integers in such a way that the resulting sequence of integers satisfies the following three conditions:

  1. the resulting sequence is not empty;
  2. the exclusive or (xor operation) of all the integers in the resulting sequence equals 0;
  3. if you write all the integers of the resulting sequence (from beginning to the end) in a row in the decimal numeral system and without any spaces, the written number is divisible by p.

You are given the sequence of n integers a and a prime number p, find a way to satisfy the described conditions.

Input

The first line of the input contains two integers n and p (1 ≤ n, p ≤ 50000). Next line contains n space-separated distinct integers a1, a2, ..., an (1 ≤ ai ≤ n).

It is guaranteed that p is a prime number.

Output

If there is no solution for the given input, print "No" (without quotes) in the only line of the output.

Otherwise print "Yes" in the first line of output. The second line should contain an integer k (k > 0) specifying the number of remaining elements and the third line should contain k distinct integers x1, x2, ..., xk (1 ≤ xi ≤ n). These integers mean that you should remove all integers from the sequence except integers ax1, ax2, ..., axk to satisfy the described conditions.

If there are multiple solutions, any of them will be accepted.

Examples

Input

3 3
1 2 3

Output

Yes
3
1 2 3

Input

3 5
1 2 3

Output

No


You are given a square matrix consisting of n rows and n columns. We assume that the rows are numbered from 1 to n from top to bottom and the columns are numbered from 1 to n from left to right. Some cells (n - 1 cells in total) of the the matrix are filled with ones, the remaining cells are filled with zeros. We can apply the following operations to the matrix:

  1. Swap i-th and j-th rows of the matrix;
  2. Swap i-th and j-th columns of the matrix.

You are asked to transform the matrix into a special form using these operations. In that special form all the ones must be in the cells that lie below the main diagonal. Cell of the matrix, which is located on the intersection of the i-th row and of the j-th column, lies below the main diagonal if i > j.

Input

The first line contains an integer n (2 ≤ n ≤ 1000) — the number of rows and columns. Then follow n - 1 lines that contain one's positions, one per line. Each position is described by two integers xk, yk (1 ≤ xk, yk ≤ n), separated by a space. A pair (xk, yk) means that the cell, which is located on the intersection of the xk-th row and of the yk-th column, contains one.

It is guaranteed that all positions are distinct.

Output

Print the description of your actions. These actions should transform the matrix to the described special form.

In the first line you should print a non-negative integer m (m ≤ 105) — the number of actions. In each of the next m lines print three space-separated integers t, i, j (1 ≤ t ≤ 2, 1 ≤ i, j ≤ n, i ≠ j), where t = 1 if you want to swap rows, t = 2 if you want to swap columns, and i and j denote the numbers of rows or columns respectively.

Please note, that you do not need to minimize the number of operations, but their number should not exceed 105. If there are several solutions, you may print any of them.

Examples

Input

2
1 2

Output

2
2 1 2
1 1 2

Input

3
3 1
1 3

Output

3
2 2 3
1 1 3
1 1 2

Input

3
2 1
3 2

Output

0


There are n students living in the campus. Every morning all students wake up at the same time and go to wash. There are m rooms with wash basins. The i-th of these rooms contains ai wash basins. Every student independently select one the rooms with equal probability and goes to it. After all students selected their rooms, students in each room divide into queues by the number of wash basins so that the size of the largest queue is the least possible. Calculate the expected value of the size of the largest queue among all rooms.

Input

The first line contains two positive integers n and m (1 ≤ n, m ≤ 50) — the amount of students and the amount of rooms. The second line contains m integers a1, a2, ... , am (1 ≤ ai ≤ 50). ai means the amount of wash basins in the i-th room.

Output

Output single number: the expected value of the size of the largest queue. Your answer must have an absolute or relative error less than 10 - 9.

Examples

Input

1 1
2

Output

1.00000000000000000000

Input

2 2
1 1

Output

1.50000000000000000000

Input

2 3
1 1 1

Output

1.33333333333333350000

Input

7 5
1 1 2 3 1

Output

2.50216960000000070000


During the last Sereja's Codesecrof round the server crashed many times, so the round was decided to be made unrated for some participants.

Let's assume that n people took part in the contest. Let's assume that the participant who got the first place has rating a1, the second place participant has rating a2, ..., the n-th place participant has rating an. Then changing the rating on the Codesecrof site is calculated by the formula <image>.

After the round was over, the Codesecrof management published the participants' results table. They decided that if for a participant di < k, then the round can be considered unrated for him. But imagine the management's surprise when they found out that the participants' rating table is dynamic. In other words, when some participant is removed from the rating, he is removed from the results' table and the rating is recalculated according to the new table. And of course, all applications for exclusion from the rating are considered in view of the current table.

We know that among all the applications for exclusion from the rating the first application to consider is from the participant with the best rank (the rank with the minimum number), for who di < k. We also know that the applications for exclusion from rating were submitted by all participants.

Now Sereja wonders, what is the number of participants to be excluded from the contest rating, and the numbers of the participants in the original table in the order of their exclusion from the rating. Pay attention to the analysis of the first test case for a better understanding of the statement.

Input

The first line contains two integers n, k (1 ≤ n ≤ 2·105, - 109 ≤ k ≤ 0). The second line contains n space-separated integers a1, a2, ..., an (1 ≤ ai ≤ 109) — ratings of the participants in the initial table.

Output

Print the numbers of participants in the order in which they were removed from the table. Print the initial numbers of the participants, that is, the numbers that the participants had in the initial table.

Examples

Input

5 0
5 3 4 1 2

Output

2
3
4

Input

10 -10
5 5 1 7 5 1 2 4 9 2

Output

2
4
5
7
8
9

Note

Consider the first test sample.

  1. Initially the sequence of the contest participants' ratings equals [5, 3, 4, 1, 2]. You can use this sequence to calculate the sequence of rating changes: [0, -9, -13, 8, 14]. According to the problem statement, the application of the participant who won the second place will be considered first.
  2. As soon as the second place winner is out from the ratings, the participants' rating sequence will equal [5, 4, 1, 2]. By this sequence you can count the new sequence of rating changes: [0, -8, 2, 6]. According to the problem statement, the application of the participant who won the second place will be considered. Initially this participant won third place.
  3. The new rating sequence equals [5, 1, 2], the new sequence of rating changes equals [0, -1, 1]. The second place participant's application is taken into consideration, initially this participant won the fourth place.
  4. The new rating sequence equals [5, 2], the new sequence of rating changes equals [0, 0]. No more applications will be considered.

Thus, you should print 2, 3, 4.


A divisor tree is a rooted tree that meets the following conditions:

  * Each vertex of the tree contains a positive integer number.
  * The numbers written in the leaves of the tree are prime numbers.
  * For any inner vertex, the number within it is equal to the product of the numbers written in its children.

Manao has n distinct integers a1, a2, ..., an. He tries to build a divisor tree which contains each of these numbers. That is, for each ai, there should be at least one vertex in the tree which contains ai. Manao loves compact style, but his trees are too large. Help Manao determine the minimum possible number of vertices in the divisor tree sought.

Input

The first line contains a single integer n (1 ≤ n ≤ 8). The second line contains n distinct space-separated integers ai (2 ≤ ai ≤ 1012).

Output

Print a single integer — the minimum number of vertices in the divisor tree that contains each of the numbers ai.

Examples

Input

2
6 10

Output

7

Input

4
6 72 8 4

Output

12

Input

1
7

Output

1

Note

Sample 1. The smallest divisor tree looks this way: <image>

Sample 2. In this case you can build the following divisor tree: <image>

Sample 3. Note that the tree can consist of a single vertex.


Levko has an array that consists of integers: a1, a2, ... , an. But he doesn’t like this array at all.

Levko thinks that the beauty of the array a directly depends on value c(a), which can be calculated by the formula:

<image> The less value c(a) is, the more beautiful the array is.

It’s time to change the world and Levko is going to change his array for the better. To be exact, Levko wants to change the values of at most k array elements (it is allowed to replace the values by any integers). Of course, the changes should make the array as beautiful as possible.

Help Levko and calculate what minimum number c(a) he can reach.

Input

The first line contains two integers n and k (1 ≤ k ≤ n ≤ 2000). The second line contains space-separated integers a1, a2, ... , an ( - 109 ≤ ai ≤ 109).

Output

A single number — the minimum value of c(a) Levko can get.

Examples

Input

5 2
4 7 4 7 4

Output

0

Input

3 1
-100 0 100

Output

100

Input

6 3
1 2 3 7 8 9

Output

1

Note

In the first sample Levko can change the second and fourth elements and get array: 4, 4, 4, 4, 4.

In the third sample he can get array: 1, 2, 3, 4, 5, 6.


Iahubina is tired of so many complicated languages, so she decided to invent a new, simple language. She already made a dictionary consisting of n 3-words. A 3-word is a sequence of exactly 3 lowercase letters of the first 24 letters of the English alphabet (a to x). She decided that some of the letters are vowels, and all the others are consonants. The whole language is based on a simple rule: any word that contains at least one vowel is correct.

Iahubina forgot which letters are the vowels, and wants to find some possible correct sets of vowels. She asks Iahub questions. In each question, she will give Iahub a set of letters considered vowels (in this question). For each question she wants to know how many words of the dictionary are correct, considering the given set of vowels.

Iahubina wants to know the xor of the squared answers to all the possible questions. There are 224 different questions, they are all subsets of the set of the first 24 letters of the English alphabet. Help Iahub find that number.

Input

The first line contains one integer, n (1 ≤ n ≤ 104). Each of the next n lines contains a 3-word consisting of 3 lowercase letters. There will be no two identical 3-words.

Output

Print one number, the xor of the squared answers to the queries.

Examples

Input

5
abc
aaa
ada
bcd
def

Output

0


Game "Minesweeper 1D" is played on a line of squares, the line's height is 1 square, the line's width is n squares. Some of the squares contain bombs. If a square doesn't contain a bomb, then it contains a number from 0 to 2 — the total number of bombs in adjacent squares.

For example, the correct field to play looks like that: 001*2***101*. The cells that are marked with "*" contain bombs. Note that on the correct field the numbers represent the number of bombs in adjacent cells. For example, field 2* is not correct, because cell with value 2 must have two adjacent cells with bombs.

Valera wants to make a correct field to play "Minesweeper 1D". He has already painted a squared field with width of n cells, put several bombs on the field and wrote numbers into some cells. Now he wonders how many ways to fill the remaining cells with bombs and numbers are there if we should get a correct field in the end.

Input

The first line contains sequence of characters without spaces s1s2... sn (1 ≤ n ≤ 106), containing only characters "*", "?" and digits "0", "1" or "2". If character si equals "*", then the i-th cell of the field contains a bomb. If character si equals "?", then Valera hasn't yet decided what to put in the i-th cell. Character si, that is equal to a digit, represents the digit written in the i-th square.

Output

Print a single integer — the number of ways Valera can fill the empty cells and get a correct field.

As the answer can be rather large, print it modulo 1000000007 (109 + 7).

Examples

Input

?01???

Output

4

Input

?

Output

2

Input

**12

Output

0

Input

1

Output

0

Note

In the first test sample you can get the following correct fields: 001**1, 001***, 001*2*, 001*10.


One day two students, Grisha and Diana, found themselves in the university chemistry lab. In the lab the students found n test tubes with mercury numbered from 1 to n and decided to conduct an experiment.

The experiment consists of q steps. On each step, one of the following actions occurs:

  1. Diana pours all the contents from tube number pi and then pours there exactly xi liters of mercury.
  2. Let's consider all the ways to add vi liters of water into the tubes; for each way let's count the volume of liquid (water and mercury) in the tube with water with maximum amount of liquid; finally let's find the minimum among counted maximums. That is the number the students want to count. At that, the students don't actually pour the mercury. They perform calculations without changing the contents of the tubes.

Unfortunately, the calculations proved to be too complex and the students asked you to help them. Help them conduct the described experiment.

Input

The first line contains two integers n and q (1 ≤ n, q ≤ 105) — the number of tubes ans the number of experiment steps. The next line contains n space-separated integers: h1, h2, ..., hn (0 ≤ hi ≤ 109), where hi is the volume of mercury in the і-th tube at the beginning of the experiment.

The next q lines contain the game actions in the following format:

  * A line of form "1 pi xi" means an action of the first type (1 ≤ pi ≤ n; 0 ≤ xi ≤ 109).
  * A line of form "2 vi" means an action of the second type (1 ≤ vi ≤ 1015).

It is guaranteed that there is at least one action of the second type. It is guaranteed that all numbers that describe the experiment are integers.

Output

For each action of the second type print the calculated value. The answer will be considered correct if its relative or absolute error doesn't exceed 10 - 4.

Examples

Input

3 3
1 2 0
2 2
1 2 1
2 3

Output

1.50000
1.66667

Input

4 5
1 3 0 1
2 3
2 1
1 3 2
2 3
2 4

Output

1.66667
1.00000
2.33333
2.66667


One day, Twilight Sparkle is interested in how to sort a sequence of integers a1, a2, ..., an in non-decreasing order. Being a young unicorn, the only operation she can perform is a unit shift. That is, she can move the last element of the sequence to its beginning:

a1, a2, ..., an → an, a1, a2, ..., an - 1.

Help Twilight Sparkle to calculate: what is the minimum number of operations that she needs to sort the sequence?

Input

The first line contains an integer n (2 ≤ n ≤ 105). The second line contains n integer numbers a1, a2, ..., an (1 ≤ ai ≤ 105).

Output

If it's impossible to sort the sequence output -1. Otherwise output the minimum number of operations Twilight Sparkle needs to sort it.

Examples

Input

2
2 1

Output

1

Input

3
1 3 2

Output

-1

Input

2
1 2

Output

0


Dreamoon has a string s and a pattern string p. He first removes exactly x characters from s obtaining string s' as a result. Then he calculates <image> that is defined as the maximal number of non-overlapping substrings equal to p that can be found in s'. He wants to make this number as big as possible.

More formally, let's define <image> as maximum value of <image> over all s' that can be obtained by removing exactly x characters from s. Dreamoon wants to know <image> for all x from 0 to |s| where |s| denotes the length of string s.

Input

The first line of the input contains the string s (1 ≤ |s| ≤ 2 000).

The second line of the input contains the string p (1 ≤ |p| ≤ 500).

Both strings will only consist of lower case English letters.

Output

Print |s| + 1 space-separated integers in a single line representing the <image> for all x from 0 to |s|.

Examples

Input

aaaaa
aa

Output

2 2 1 1 0 0

Input

axbaxxb
ab

Output

0 1 1 2 1 1 0 0

Note

For the first sample, the corresponding optimal values of s' after removal 0 through |s| = 5 characters from s are {"aaaaa", "aaaa", "aaa", "aa", "a", ""}.

For the second sample, possible corresponding optimal values of s' are {"axbaxxb", "abaxxb", "axbab", "abab", "aba", "ab", "a", ""}.


One hot summer day Pete and his friend Billy decided to buy a watermelon. They chose the biggest and the ripest one, in their opinion. After that the watermelon was weighed, and the scales showed w kilos. They rushed home, dying of thirst, and decided to divide the berry, however they faced a hard problem.

Pete and Billy are great fans of even numbers, that's why they want to divide the watermelon in such a way that each of the two parts weighs even number of kilos, at the same time it is not obligatory that the parts are equal. The boys are extremely tired and want to start their meal as soon as possible, that's why you should help them and find out, if they can divide the watermelon in the way they want. For sure, each of them should get a part of positive weight.

Input

The first (and the only) input line contains integer number w (1 ≤ w ≤ 100) — the weight of the watermelon bought by the boys.

Output

Print YES, if the boys can divide the watermelon into two parts, each of them weighing even number of kilos; and NO in the opposite case.

Examples

Input

8

Output

YES

Note

For example, the boys can divide the watermelon into two parts of 2 and 6 kilos respectively (another variant — two parts of 4 and 4 kilos).


Polycarpus has a finite sequence of opening and closing brackets. In order not to fall asleep in a lecture, Polycarpus is having fun with his sequence. He is able to perform two operations:

  * adding any bracket in any position (in the beginning, the end, or between any two existing brackets);
  * cyclic shift — moving the last bracket from the end of the sequence to the beginning.

Polycarpus can apply any number of operations to his sequence and adding a cyclic shift in any order. As a result, he wants to get the correct bracket sequence of the minimum possible length. If there are several such sequences, Polycarpus is interested in the lexicographically smallest one. Help him find such a sequence.

Acorrect bracket sequence is a sequence of opening and closing brackets, from which you can get a correct arithmetic expression by adding characters "1" and "+" . Each opening bracket must correspond to a closed one. For example, the sequences "(())()", "()", "(()(()))" are correct and ")(", "(()" and "(()))(" are not.

The sequence a1 a2... an is lexicographically smaller than sequence b1 b2... bn, if there is such number i from 1 to n, thatak = bk for 1 ≤ k < i and ai < bi. Consider that "("  < ")".

Input

The first line contains Polycarpus's sequence consisting of characters "(" and ")". The length of a line is from 1 to 1 000 000.

Output

Print a correct bracket sequence of the minimum length that Polycarpus can obtain by his operations. If there are multiple such sequences, print the lexicographically minimum one.

Examples

Input

()(())

Output

(())()

Input

()(

Output

(())

Note

The sequence in the first example is already correct, but to get the lexicographically minimum answer, you need to perform four cyclic shift operations. In the second example you need to add a closing parenthesis between the second and third brackets and make a cyclic shift. You can first make the shift, and then add the bracket at the end.


You are given string s. Your task is to determine if the given string s contains two non-overlapping substrings "AB" and "BA" (the substrings can go in any order).

Input

The only line of input contains a string s of length between 1 and 105 consisting of uppercase Latin letters.

Output

Print "YES" (without the quotes), if string s contains two non-overlapping substrings "AB" and "BA", and "NO" otherwise.

Examples

Input

ABA

Output

NO

Input

BACFAB

Output

YES

Input

AXBYBXA

Output

NO

Note

In the first sample test, despite the fact that there are substrings "AB" and "BA", their occurrences overlap, so the answer is "NO".

In the second sample test there are the following occurrences of the substrings: BACFAB.

In the third sample test there is no substring "AB" nor substring "BA".


You are given a sequence of numbers a1, a2, ..., an, and a number m.

Check if it is possible to choose a non-empty subsequence aij such that the sum of numbers in this subsequence is divisible by m.

Input

The first line contains two numbers, n and m (1 ≤ n ≤ 106, 2 ≤ m ≤ 103) — the size of the original sequence and the number such that sum should be divisible by it.

The second line contains n integers a1, a2, ..., an (0 ≤ ai ≤ 109).

Output

In the single line print either "YES" (without the quotes) if there exists the sought subsequence, or "NO" (without the quotes), if such subsequence doesn't exist.

Examples

Input

3 5
1 2 3

Output

YES

Input

1 6
5

Output

NO

Input

4 6
3 1 1 3

Output

YES

Input

6 6
5 5 5 5 5 5

Output

YES

Note

In the first sample test you can choose numbers 2 and 3, the sum of which is divisible by 5.

In the second sample test the single non-empty subsequence of numbers is a single number 5. Number 5 is not divisible by 6, that is, the sought subsequence doesn't exist.

In the third sample test you need to choose two numbers 3 on the ends.

In the fourth sample test you can take the whole subsequence.


Rooted tree is a connected graph without any simple cycles with one vertex selected as a root. In this problem the vertex number 1 will always serve as a root.

Lowest common ancestor of two vertices u and v is the farthest from the root vertex that lies on both the path from u to the root and on path from v to the root. We will denote it as LCA(u, v).

Sandy had a rooted tree consisting of n vertices that she used to store her nuts. Unfortunately, the underwater storm broke her tree and she doesn't remember all it's edges. She only managed to restore m edges of the initial tree and q triples ai, bi and ci, for which she supposes LCA(ai, bi) = ci.

Help Sandy count the number of trees of size n with vertex 1 as a root, that match all the information she remembered. If she made a mess and there are no such trees then print 0. Two rooted trees are considered to be distinct if there exists an edge that occur in one of them and doesn't occur in the other one.

Input

The first line of the input contains three integers n, m and q (1 ≤ n ≤ 13, 0 ≤ m < n, 0 ≤ q ≤ 100) — the number of vertices, the number of edges and LCA triples remembered by Sandy respectively.

Each of the next m lines contains two integers ui and vi (1 ≤ ui, vi ≤ n, ui ≠ vi) — the numbers of vertices connected by the i-th edge. It's guaranteed that this set of edges is a subset of edges of some tree.

The last q lines contain the triplets of numbers ai, bi, ci (1 ≤ ai, bi, ci ≤ n). Each of these triples define LCA(ai, bi) = ci. It's not guaranteed that there exists a tree that satisfy all the given LCA conditions.

Output

Print a single integer — the number of trees of size n that satisfy all the conditions.

Examples

Input

4 0 0

Output

16

Input

4 0 1
3 4 2

Output

1

Input

3 1 0
1 2

Output

2

Input

3 0 2
2 3 2
2 3 1

Output

0

Input

4 1 2
1 2
2 2 2
3 4 2

Output

1

Note

In the second sample correct answer looks like this:

<image>

In the third sample there are two possible trees:

<image> <image>

In the fourth sample the answer is 0 because the information about LCA is inconsistent.


Professor GukiZ has two arrays of integers, a and b. Professor wants to make the sum of the elements in the array a sa as close as possible to the sum of the elements in the array b sb. So he wants to minimize the value v = |sa - sb|.

In one operation professor can swap some element from the array a and some element from the array b. For example if the array a is [5, 1, 3, 2, 4] and the array b is [3, 3, 2] professor can swap the element 5 from the array a and the element 2 from the array b and get the new array a [2, 1, 3, 2, 4] and the new array b [3, 3, 5].

Professor doesn't want to make more than two swaps. Find the minimal value v and some sequence of no more than two swaps that will lead to the such value v. Professor makes swaps one by one, each new swap he makes with the new arrays a and b.

Input

The first line contains integer n (1 ≤ n ≤ 2000) — the number of elements in the array a.

The second line contains n integers ai ( - 109 ≤ ai ≤ 109) — the elements of the array a.

The third line contains integer m (1 ≤ m ≤ 2000) — the number of elements in the array b.

The fourth line contains m integers bj ( - 109 ≤ bj ≤ 109) — the elements of the array b.

Output

In the first line print the minimal value v = |sa - sb| that can be got with no more than two swaps.

The second line should contain the number of swaps k (0 ≤ k ≤ 2).

Each of the next k lines should contain two integers xp, yp (1 ≤ xp ≤ n, 1 ≤ yp ≤ m) — the index of the element in the array a and the index of the element in the array b in the p-th swap.

If there are several optimal solutions print any of them. Print the swaps in order the professor did them.

Examples

Input

5
5 4 3 2 1
4
1 1 1 1

Output

1
2
1 1
4 2

Input

5
1 2 3 4 5
1
15

Output

0
0

Input

5
1 2 3 4 5
4
1 2 3 4

Output

1
1
3 1


Little Artem is fond of dancing. Most of all dances Artem likes rueda — Cuban dance that is danced by pairs of boys and girls forming a circle and dancing together.

More detailed, there are n pairs of boys and girls standing in a circle. Initially, boy number 1 dances with a girl number 1, boy number 2 dances with a girl number 2 and so on. Girls are numbered in the clockwise order. During the dance different moves are announced and all pairs perform this moves. While performing moves boys move along the circle, while girls always stay at their initial position. For the purpose of this problem we consider two different types of moves:

  1. Value x and some direction are announced, and all boys move x positions in the corresponding direction.
  2. Boys dancing with even-indexed girls swap positions with boys who are dancing with odd-indexed girls. That is the one who was dancing with the girl 1 swaps with the one who was dancing with the girl number 2, while the one who was dancing with girl number 3 swaps with the one who was dancing with the girl number 4 and so one. It's guaranteed that n is even.

Your task is to determine the final position of each boy.

Input

The first line of the input contains two integers n and q (2 ≤ n ≤ 1 000 000, 1 ≤ q ≤ 2 000 000) — the number of couples in the rueda and the number of commands to perform, respectively. It's guaranteed that n is even.

Next q lines contain the descriptions of the commands. Each command has type as the integer 1 or 2 first. Command of the first type is given as x ( - n ≤ x ≤ n), where 0 ≤ x ≤ n means all boys moves x girls in clockwise direction, while  - x means all boys move x positions in counter-clockwise direction. There is no other input for commands of the second type.

Output

Output n integers, the i-th of them should be equal to the index of boy the i-th girl is dancing with after performing all q moves.

Examples

Input

6 3
1 2
2
1 2

Output

4 3 6 5 2 1

Input

2 3
1 1
2
1 -2

Output

1 2

Input

4 2
2
1 3

Output

1 4 3 2


Little Petya has recently started attending a programming club. Naturally he is facing the problem of choosing a programming language. After long considerations he realized that Java is the best choice. The main argument in favor of choosing Java was that it has a very large integer data type, called BigInteger.

But having attended several classes of the club, Petya realized that not all tasks require using the BigInteger type. It turned out that in some tasks it is much easier to use small data types. That's why a question arises: "Which integer type to use if one wants to store a positive integer n?"

Petya knows only 5 integer types:

1) byte occupies 1 byte and allows you to store numbers from  - 128 to 127

2) short occupies 2 bytes and allows you to store numbers from  - 32768 to 32767

3) int occupies 4 bytes and allows you to store numbers from  - 2147483648 to 2147483647

4) long occupies 8 bytes and allows you to store numbers from  - 9223372036854775808 to 9223372036854775807

5) BigInteger can store any integer number, but at that it is not a primitive type, and operations with it are much slower.

For all the types given above the boundary values are included in the value range.

From this list, Petya wants to choose the smallest type that can store a positive integer n. Since BigInteger works much slower, Peter regards it last. Help him.

Input

The first line contains a positive number n. It consists of no more than 100 digits and doesn't contain any leading zeros. The number n can't be represented as an empty string.

Please, do not use %lld specificator to read or write 64-bit integers in C++. It is preffered to use cout (also you may use %I64d).

Output

Print the first type from the list "byte, short, int, long, BigInteger", that can store the natural number n, in accordance with the data given above.

Examples

Input

127

Output

byte

Input

130

Output

short

Input

123456789101112131415161718192021222324

Output

BigInteger


Heidi has finally found the mythical Tree of Life – a legendary combinatorial structure which is said to contain a prophecy crucially needed to defeat the undead armies.

On the surface, the Tree of Life is just a regular undirected tree well-known from computer science. This means that it is a collection of n points (called vertices), some of which are connected using n - 1 line segments (edges) so that each pair of vertices is connected by a path (a sequence of one or more edges).

To decipher the prophecy, Heidi needs to perform a number of steps. The first is counting the number of lifelines in the tree – these are paths of length 2, i.e., consisting of two edges. Help her!

Input

The first line of the input contains a single integer n – the number of vertices in the tree (1 ≤ n ≤ 10000). The vertices are labeled with the numbers from 1 to n. Then n - 1 lines follow, each describing one edge using two space-separated numbers a b – the labels of the vertices connected by the edge (1 ≤ a < b ≤ n). It is guaranteed that the input represents a tree.

Output

Print one integer – the number of lifelines in the tree.

Examples

Input

4
1 2
1 3
1 4

Output

3

Input

5
1 2
2 3
3 4
3 5

Output

4

Note

In the second sample, there are four lifelines: paths between vertices 1 and 3, 2 and 4, 2 and 5, and 4 and 5.


ZS the Coder has a large tree. It can be represented as an undirected connected graph of n vertices numbered from 0 to n - 1 and n - 1 edges between them. There is a single nonzero digit written on each edge.

One day, ZS the Coder was bored and decided to investigate some properties of the tree. He chose a positive integer M, which is coprime to 10, i.e. <image>.

ZS consider an ordered pair of distinct vertices (u, v) interesting when if he would follow the shortest path from vertex u to vertex v and write down all the digits he encounters on his path in the same order, he will get a decimal representaion of an integer divisible by M.

Formally, ZS consider an ordered pair of distinct vertices (u, v) interesting if the following states true:

  * Let a1 = u, a2, ..., ak = v be the sequence of vertices on the shortest path from u to v in the order of encountering them;
  * Let di (1 ≤ i < k) be the digit written on the edge between vertices ai and ai + 1;
  * The integer <image> is divisible by M.

Help ZS the Coder find the number of interesting pairs!

Input

The first line of the input contains two integers, n and M (2 ≤ n ≤ 100 000, 1 ≤ M ≤ 109, <image>) — the number of vertices and the number ZS has chosen respectively.

The next n - 1 lines contain three integers each. i-th of them contains ui, vi and wi, denoting an edge between vertices ui and vi with digit wi written on it (0 ≤ ui, vi < n, 1 ≤ wi ≤ 9).

Output

Print a single integer — the number of interesting (by ZS the Coder's consideration) pairs.

Examples

Input

6 7
0 1 2
4 2 4
2 0 1
3 0 9
2 5 7

Output

7

Input

5 11
1 2 3
2 0 3
3 0 3
4 3 3

Output

8

Note

In the first sample case, the interesting pairs are (0, 4), (1, 2), (1, 5), (3, 2), (2, 5), (5, 2), (3, 5). The numbers that are formed by these pairs are 14, 21, 217, 91, 7, 7, 917 respectively, which are all multiples of 7. Note that (2, 5) and (5, 2) are considered different.

<image>

In the second sample case, the interesting pairs are (4, 0), (0, 4), (3, 2), (2, 3), (0, 1), (1, 0), (4, 1), (1, 4), and 6 of these pairs give the number 33 while 2 of them give the number 3333, which are all multiples of 11.

<image>


Ostap already settled down in Rio de Janiero suburb and started to grow a tree in his garden. Recall that a tree is a connected undirected acyclic graph.

Ostap's tree now has n vertices. He wants to paint some vertices of the tree black such that from any vertex u there is at least one black vertex v at distance no more than k. Distance between two vertices of the tree is the minimum possible number of edges of the path between them.

As this number of ways to paint the tree can be large, Ostap wants you to compute it modulo 109 + 7. Two ways to paint the tree are considered different if there exists a vertex that is painted black in one way and is not painted in the other one.

Input

The first line of the input contains two integers n and k (1 ≤ n ≤ 100, 0 ≤ k ≤ min(20, n - 1)) — the number of vertices in Ostap's tree and the maximum allowed distance to the nearest black vertex. Don't miss the unusual constraint for k.

Each of the next n - 1 lines contain two integers ui and vi (1 ≤ ui, vi ≤ n) — indices of vertices, connected by the i-th edge. It's guaranteed that given graph is a tree.

Output

Print one integer — the remainder of division of the number of ways to paint the tree by 1 000 000 007 (109 + 7).

Examples

Input

2 0
1 2

Output

1

Input

2 1
1 2

Output

3

Input

4 1
1 2
2 3
3 4

Output

9

Input

7 2
1 2
2 3
1 4
4 5
1 6
6 7

Output

91

Note

In the first sample, Ostap has to paint both vertices black.

In the second sample, it is enough to paint only one of two vertices, thus the answer is 3: Ostap can paint only vertex 1, only vertex 2, vertices 1 and 2 both.

In the third sample, the valid ways to paint vertices are: {1, 3}, {1, 4}, {2, 3}, {2, 4}, {1, 2, 3}, {1, 2, 4}, {1, 3, 4}, {2, 3, 4}, {1, 2, 3, 4}.


You have got a new job, and it's very interesting, you are a ship captain. Your first task is to move your ship from one point to another point, and for sure you want to move it at the minimum cost.

And it's well known that the shortest distance between any 2 points is the length of the line segment between these 2 points. But unfortunately there is an island in the sea, so sometimes you won't be able to move your ship in the line segment between the 2 points.

You can only move to safe points. A point is called safe if it's on the line segment between the start and end points, or if it's on the island's edge.

But you are too lucky, you have got some clever and strong workers and they can help you in your trip, they can help you move the ship in the sea and they will take 1 Egyptian pound for each moving unit in the sea, and they can carry the ship (yes, they are very strong) and walk on the island and they will take 2 Egyptian pounds for each moving unit in the island. The money which you will give to them will be divided between all workers, so the number of workers does not matter here.

You can move your ship on the island edge, and it will be considered moving in the sea.

Now you have a sea map, and you have to decide what is the minimum cost for your trip.

Your starting point is (xStart, yStart), and the end point is (xEnd, yEnd), both points will be different.

The island will be a convex polygon and there will be no more than 2 polygon points on the same line, also the starting and the end points won't be inside or on the boundary of the island. The points for the polygon will be given in the anti-clockwise order.

Input

The first line contains 4 integers, xStart, yStart, xEnd and yEnd ( - 100 ≤ xStart, yStart, xEnd, yEnd ≤ 100). The second line contains an integer n, which is the number of points in the polygon (3 ≤ n ≤ 30), followed by a line containing n pairs of integers x and y, which are the coordinates of the points ( - 100 ≤ x, y ≤ 100), the polygon points will be distinct.

Output

Print one line which contains the minimum possible cost. The absolute or relative error in the answer should not exceed 10 - 6.

Examples

Input

1 7 6 7
4
4 2 4 12 3 12 3 2

Output

6.000000000

Input

-1 0 2 0
4
0 0 1 0 1 1 0 1

Output

3.000000000


Innokenty is a president of a new football league in Byteland. The first task he should do is to assign short names to all clubs to be shown on TV next to the score. Of course, the short names should be distinct, and Innokenty wants that all short names consist of three letters.

Each club's full name consist of two words: the team's name and the hometown's name, for example, "DINAMO BYTECITY". Innokenty doesn't want to assign strange short names, so he wants to choose such short names for each club that:

  1. the short name is the same as three first letters of the team's name, for example, for the mentioned club it is "DIN",
  2. or, the first two letters of the short name should be the same as the first two letters of the team's name, while the third letter is the same as the first letter in the hometown's name. For the mentioned club it is "DIB".

Apart from this, there is a rule that if for some club x the second option of short name is chosen, then there should be no club, for which the first option is chosen which is the same as the first option for the club x. For example, if the above mentioned club has short name "DIB", then no club for which the first option is chosen can have short name equal to "DIN". However, it is possible that some club have short name "DIN", where "DI" are the first two letters of the team's name, and "N" is the first letter of hometown's name. Of course, no two teams can have the same short name.

Help Innokenty to choose a short name for each of the teams. If this is impossible, report that. If there are multiple answer, any of them will suit Innokenty. If for some team the two options of short name are equal, then Innokenty will formally think that only one of these options is chosen.

Input

The first line contains a single integer n (1 ≤ n ≤ 1000) — the number of clubs in the league.

Each of the next n lines contains two words — the team's name and the hometown's name for some club. Both team's name and hometown's name consist of uppercase English letters and have length at least 3 and at most 20.

Output

It it is not possible to choose short names and satisfy all constraints, print a single line "NO".

Otherwise, in the first line print "YES". Then print n lines, in each line print the chosen short name for the corresponding club. Print the clubs in the same order as they appeared in input.

If there are multiple answers, print any of them.

Examples

Input

2
DINAMO BYTECITY
FOOTBALL MOSCOW

Output

YES
DIN
FOO

Input

2
DINAMO BYTECITY
DINAMO BITECITY

Output

NO

Input

3
PLAYFOOTBALL MOSCOW
PLAYVOLLEYBALL SPB
GOGO TECHNOCUP

Output

YES
PLM
PLS
GOG

Input

3
ABC DEF
ABC EFG
ABD OOO

Output

YES
ABD
ABE
ABO

Note

In the first sample Innokenty can choose first option for both clubs.

In the second example it is not possible to choose short names, because it is not possible that one club has first option, and the other has second option if the first options are equal for both clubs.

In the third example Innokenty can choose the second options for the first two clubs, and the first option for the third club.

In the fourth example note that it is possible that the chosen short name for some club x is the same as the first option of another club y if the first options of x and y are different.


A few years ago Sajjad left his school and register to another one due to security reasons. Now he wishes to find Amir, one of his schoolmates and good friends.

There are n schools numerated from 1 to n. One can travel between each pair of them, to do so, he needs to buy a ticket. The ticker between schools i and j costs <image> and can be used multiple times. Help Sajjad to find the minimum cost he needs to pay for tickets to visit all schools. He can start and finish in any school.

Input

The first line contains a single integer n (1 ≤ n ≤ 105) — the number of schools.

Output

Print single integer: the minimum cost of tickets needed to visit all schools.

Examples

Input

2

Output

0

Input

10

Output

4

Note

In the first example we can buy a ticket between the schools that costs <image>.


You are given a connected weighted graph with n vertices and m edges. The graph doesn't contain loops nor multiple edges. Consider some edge with id i. Let's determine for this edge the maximum integer weight we can give to it so that it is contained in all minimum spanning trees of the graph if we don't change the other weights.

You are to determine this maximum weight described above for each edge. You should calculate the answer for each edge independently, it means there can't be two edges with changed weights at the same time.

Input

The first line contains two integers n and m (2 ≤ n ≤ 2·105, n - 1 ≤ m ≤ 2·105), where n and m are the number of vertices and the number of edges in the graph, respectively.

Each of the next m lines contains three integers u, v and c (1 ≤ v, u ≤ n, v ≠ u, 1 ≤ c ≤ 109) meaning that there is an edge between vertices u and v with weight c.

Output

Print the answer for each edge in the order the edges are given in the input. If an edge is contained in every minimum spanning tree with any weight, print -1 as the answer.

Examples

Input

4 4
1 2 2
2 3 2
3 4 2
4 1 3

Output

2 2 2 1

Input

4 3
1 2 2
2 3 2
3 4 2

Output

-1 -1 -1


Arpa has found a list containing n numbers. He calls a list bad if and only if it is not empty and gcd (see notes section for more information) of numbers in the list is 1.

Arpa can perform two types of operations:

  * Choose a number and delete it with cost x.
  * Choose a number and increase it by 1 with cost y.

Arpa can apply these operations to as many numbers as he wishes, and he is allowed to apply the second operation arbitrarily many times on the same number.

Help Arpa to find the minimum possible cost to make the list good.

Input

First line contains three integers n, x and y (1 ≤ n ≤ 5·105, 1 ≤ x, y ≤ 109) — the number of elements in the list and the integers x and y.

Second line contains n integers a1, a2, ..., an (1 ≤ ai ≤ 106) — the elements of the list.

Output

Print a single integer: the minimum possible cost to make the list good.

Examples

Input

4 23 17
1 17 17 16

Output

40

Input

10 6 2
100 49 71 73 66 96 8 60 41 63

Output

10

Note

In example, number 1 must be deleted (with cost 23) and number 16 must increased by 1 (with cost 17).

A gcd (greatest common divisor) of a set of numbers is the maximum integer that divides all integers in the set. Read more about gcd [here](https://en.wikipedia.org/wiki/Greatest_common_divisor).


Merge sort is a well-known sorting algorithm. The main function that sorts the elements of array a with indices from [l, r) can be implemented as follows:

  1. If the segment [l, r) is already sorted in non-descending order (that is, for any i such that l ≤ i < r - 1 a[i] ≤ a[i + 1]), then end the function call;
  2. Let <image>;
  3. Call mergesort(a, l, mid);
  4. Call mergesort(a, mid, r);
  5. Merge segments [l, mid) and [mid, r), making the segment [l, r) sorted in non-descending order. The merge algorithm doesn't call any other functions.

The array in this problem is 0-indexed, so to sort the whole array, you need to call mergesort(a, 0, n).

The number of calls of function mergesort is very important, so Ivan has decided to calculate it while sorting the array. For example, if a = {1, 2, 3, 4}, then there will be 1 call of mergesort — mergesort(0, 4), which will check that the array is sorted and then end. If a = {2, 1, 3}, then the number of calls is 3: first of all, you call mergesort(0, 3), which then sets mid = 1 and calls mergesort(0, 1) and mergesort(1, 3), which do not perform any recursive calls because segments (0, 1) and (1, 3) are sorted.

Ivan has implemented the program that counts the number of mergesort calls, but now he needs to test it. To do this, he needs to find an array a such that a is a permutation of size n (that is, the number of elements in a is n, and every integer number from [1, n] can be found in this array), and the number of mergesort calls when sorting the array is exactly k.

Help Ivan to find an array he wants!

Input

The first line contains two numbers n and k (1 ≤ n ≤ 100000, 1 ≤ k ≤ 200000) — the size of a desired permutation and the number of mergesort calls required to sort it.

Output

If a permutation of size n such that there will be exactly k calls of mergesort while sorting it doesn't exist, output  - 1. Otherwise output n integer numbers a[0], a[1], ..., a[n - 1] — the elements of a permutation that would meet the required conditions. If there are multiple answers, print any of them.

Examples

Input

3 3

Output

2 1 3

Input

4 1

Output

1 2 3 4

Input

5 6

Output

-1


Petya has n integers: 1, 2, 3, ..., n. He wants to split these integers in two non-empty groups in such a way that the absolute difference of sums of integers in each group is as small as possible.

Help Petya to split the integers. Each of n integers should be exactly in one group.

Input

The first line contains a single integer n (2 ≤ n ≤ 60 000) — the number of integers Petya has.

Output

Print the smallest possible absolute difference in the first line.

In the second line print the size of the first group, followed by the integers in that group. You can print these integers in arbitrary order. If there are multiple answers, print any of them.

Examples

Input

4

Output

0
2 1 4

Input

2

Output

1
1 1

Note

In the first example you have to put integers 1 and 4 in the first group, and 2 and 3 in the second. This way the sum in each group is 5, and the absolute difference is 0.

In the second example there are only two integers, and since both groups should be non-empty, you have to put one integer in the first group and one in the second. This way the absolute difference of sums of integers in each group is 1.