코드
python
from typing import List
import sys
def find(order, A: List):
if 'push' in order:
p, x = str(order).split(" ")
A.append(int(x))
elif 'pop' in order:
if len(A) == 0:
print("-1")
else:
print(A[len(A)-1])
A.pop()
elif 'size' in order:
print(len(A))
elif 'empty' in order:
if len(A) == 0:
print("1")
else:
print("0")
elif 'top' in order:
if len(A) == 0:
print("-1")
else:
print(A[len(A)-1])
return A
A = []
for _ in range(int(sys.stdin.readline())):
A = find(sys.stdin.readline(), A)