Write a function in python, PushEl(e) to add a new element and
PopEl(e) to delete a element from a List ,considering them to act
as push and pop operations of the Stack data structure .
OR
Write InsertQ(C) and DeleteQ(C) methods/functions in Python
to add a new Customer and delete a Customer from a list of
Customer names, considering them to act as insert and delete
operations of the Queue
