더보기 A string S consisting of N characters is called properly nested if: S is empty; S has the form "(U)" where U is a properly nested string; S has the form "VW" where V and W are properly nested strings. For example, string "(()(())())" is properly nested but string "())" isn't. Write a function: def solution(S) that, given a string S consisting of N characters, returns 1 if string S is properl..