小红书笔试，求剩下两道的代码

string = input()
string_list = list(string)
res = []
char = ['(', ')', '<']
flag = 0 for i in string_list: if i not in char: if flag == 0:
            res.append(i) if i == '(':
        flag += 1  if i == ')':
        flag -= 1  if i == '<' and flag==0: if len(res) > 0:
            res.pop() print(''.join(res))