class Cola:
	def __init__(self):
		self.cola = []
	def vacia(self):
		if self.cola==[]:
			print (true)
		else:
			print (false)
		def primero(self):
			return self.cola[0]
		def inserta(self, elemento):
			self.cola.append(elemento)
		def suprime(self):
			del self.cola[0]