class Stack:
def __init__(self):
self.items = LinkedList()
def __str__(self):
return str(self.items)
def push(self, data):
self.items.push_back(data)
def pop(self):
return self.items.pop_back()
def peek(self):
return self.items.NodeAt(-1).data
def size(self):
return self.items.size()
def isEmpty(self):
return self.items.isEmpty()
