[백준] 10828번 - 스택 (파이썬)

import sys input=sys.stdin.readline stack = [] for i in range(int(input())): read = input().split() if(read[0] == "push"): stack.append(read[1]) elif(read[0] == "pop"): if(len(stack) == 0): print(-1) else: pop = stack.pop() print(pop) elif(read[0] == "top"): if(len(stack) == 0): print(-1) else: print(stack[-1]) elif(read[0] == "size"): print(len(stack)) elif(read[0] == "empty"): if(len(stack) ==..