F. Polynom
*special; implementation
You are given a polynom in form p(x) = (x + a1)·(x + a2)·... (x + an). Write Pike program to print it in a standard form p(x) = xn + b1xn - 1 + ... + bn - 1x + bn. You should write each addend in form «C*X^K» (for example, 5*X^8).Please, write the polynom in the shortest way, so you should skip unnecessary terms: some terms «C*X^K» should be reduced or even omitted. Look for the samples for clarification.
The first line of the input contains n (1 ≤ n ≤ 9). The following n lines contain integer ai ( - 10 ≤ ai ≤ 10).
Print the given polynom in a standard way. Note, that the answer in this problem response uniquely determined.