class Pile:
    def __init__(self):
        self.items = []
        
    def vide(self):
        return self.items == []

    def empiler(self, item):
        self.items.append(item)

    def depiler(self):
        return self.items.pop()

##    def regarder(self):
##        return self.items[len(self.items)-1]
##
##    def longeur(self):
##        return len(self.items)
##        
    def affiche(self):
        L = self.items[::-1]
        for k in L:
            print(k)