class Solution:
    def removeOuterParentheses(self, s: str) -> str:
        ans = []
        remain_left = 0 
        for c in s:
            if c == '(': 
                remain_left += 1
                if remain_left > 1: # skip(remove) left when remain_left = 1
                    ans.append(c)
            else: # ')'
                remain_left -= 1
                if remain_left > 0: # skip(remove) right when remain_left = 0
                    ans.append(c)
            
        return "".join(ans)