Without using importing Counter !

Write a program that prompts the user for a name. The program then splits the name into first and last name (case insensitive] Then it: 1. calls a function that returns a list of the common letters in first and last. The data structures used in this implementation can only be lists 2 calls a function that returns a set containing the common letters in first and last. The data structures used in this implementation can only be sets 3. prints out a sorted list version of the results from 1) and 2] Example input/output: Enter name: Barak Obama