text: stack = []
  
  # append() function to push
  # element in the stack
  stack.append('a')
  stack.append('b')
  stack.append('c')
  
  print('Initial stack')
  print(stack)
  
  # pop() function to pop
  # element from stack in
  # LIFO order
  print('\nElements popped from stack:')
  print(stack.pop())
  print(stack.pop())
  print(stack.pop())
  
  print('\nStack after elements are popped:')
  print(stack)