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class Node:

def __init__(self, data):

self.data = data

self.next = None

class Stack:

def __init__(self):

self.top = None

def push(self, data):

print(f"Adding {data} to the top of the stack")

# If there is no data, we add the value in the top element and return

if self.top == None:

self.top = Node(data)

return

new_node = Node(data)

new_node.next = self.top

self.top = new_node

def pop(self):

# If there is no data in the top node, we return

if self.top == None:

print ("There is no item on the stack to unstack")

return

print(f"Unstack {self.top.data}")

self.top = self.top.next

def printData(self):

print("Printing stack: ")

# Step through the stack and print values

tmp_node = self.top

while tmp_node != None:

print (f"[{tmp_node.data}]", end = "")

tmp_node = tmp_node.next

print("")

stack = Stack()

stack.push('a')

stack.push('b')

stack.push('c')

stack.push('d')

stack.printData()

stack.pop()

stack.push("Hello")

stack.printData()

stack.pop()

stack.pop()