class stack:
	def __init__(self):
		self.tab = []
	def isempty(self):
		return len(self.tab) == 0
	def push(self,value):
		self.tab.append(value)
	def pop(self):
		if self.isempty():
			print("The stack is empty")
		else :
			x= self.tab.pop()
			return x
	def peek(self):
		if self.isempty():
			print("The stack is empty")
		else :
			return self.tab[-1]
	def __str__(self):
		return str(self.tab)