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'''

Created by Luiz Guerra

My github github.com/LuizGuerra

'''

class Stack:

def __init__ (.self):

head = null

count = 0

def append(.self, e):

n = Node(e)

if count == 0:

head = n

count += 1

else:

n.next = head.next

head = n

def pop(.self):

n = head

head = head.next

return n.element

class Node (e):

__init__ (.self, e):

next = null

element = e