백준 10828 스택

	import sys
	n = int(sys.stdin.readline().rstrip())
	stack = []
	def push():
	li = list(command.split())
	stack.append(li[1])
	def pop():
	if len(stack) == 0:
	print(-1)
	else:
	k = stack.pop()
	print(k)
	def empty():
	if len(stack) == 0:
	print(1)
	else:
	print(0)
	def top():
	if len(stack) == 0:
	print(-1)
	else:
	print(stack[len(stack) - 1])
	for i in range(n):
	command = sys.stdin.readline().rstrip()
	if 'push' in command:
	push()
	elif 'pop' in command:
	pop()
	elif 'size' in command:
	print(len(stack))
	elif 'empty' in command:
	empty()
	elif 'top' in command:
	top()

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