J. Brackets
*special
A sequence of brackets is called balanced if one can turn it into a valid math expression by adding characters ""+"" and ""1"". For example, sequences ""(())()"", ""()"" and ""(()(()))"" are balanced, while "")("", ""(()"" and ""(()))("" are not.You are given a string which consists of opening and closing round brackets. Check whether it is a balanced bracket sequence.
The only line of input contains a string between 1 and 100 characters long, inclusive. Each character in the string will be ""("" or "")"".
Output ""YES"" if the bracket sequence is balanced, and ""NO"" otherwise (quotes for clarity only).