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class Node:

def __init__(self, value):

self.value = value

self.next = None

class Stack:

def __init__(self):

self.head = None

def push(self, node):

node.next = self.head

self.head = node

def pop(self):

if (self.head is not None):

self.head = self.head.next

def printStack(self):

node = self.head

while (node is not None):

print(node.value)

node = node.next

if __name__ == "__main__":

stack1 = Stack()

stack1.push(Node(1))

stack1.push(Node(23))

stack1.push(Node(42))

stack1.printStack()

stack1.pop()

print("------------------")

stack1.printStack()

stack1.pop()

print("------------------")

stack1.printStack()