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class Node:

def __init__(self, item, next):

self.item = item

self.next = next

class Stack:

def __init__(self):

self.last = None

def push(self, item):

self.last = Node(item, self.last)

def pop(self):

item = self.last.item

self.last = self.last.next

return item

stack = Stack()

stack.push(1)

stack.push(2)

stack.push(3)

stack.push(4)

stack.push(5)

for _ in range(5):

print(stack.pop())