Please Help me with this Python 3 programs, thank you so much

Cipher Programming Assignment To protect the content of a message, we can hide it by using an algorithm called a cipher: Cipher Description A cipher works by replacing the characters in some input. For example, we might swap each "a with a b", each "b" with a c", and each "c" with a "d". That means the word "cab" would be encrypted as "dbc" a=> b If we know the rules of a cipher, we can also go backwards to decrypt b=> a So, "dbc" becomes "cab". Requirements: In this programming assignment, you will write a program called cipher.py that uses a cipher to encode and decode secret messages Cipher Rules Use the following cipher to encode and decode your messages Input Replace with Input Replace with Input Replace with 0 The program should start with a menu. It should ask the user whether they/d like to encode a message, decode a message, or exit. The following section contains sample output