class Stack:
    def __init__(self):
        self.items = LinkedList()

    def getItems(self):
        return self.items

    def size(self):
        return self.items.size()

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

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

    def isEmpty(self):
        return self.items.isEmpty()