[Python : 백준 9012] 괄호
문제 https://www.acmicpc.net/problem/9012
문제 https://www.acmicpc.net/problem/9012
문제 https://www.acmicpc.net/problem/4949
문제 https://www.acmicpc.net/problem/4673
문제 https://www.acmicpc.net/problem/1874
문제 https://www.acmicpc.net/problem/11729