Amazon Online Assessment 2021 (OA) - Simple Cipher

As part of a Day 1 Challenge, your new team at Amazon has created a basic alphabet-based encryption and has asked members to test the cipher. A simple cipher is built on the alphabet wheel which has uppercase english letters['A'-'Z'] written on it:


This is a companion discussion topic for the original entry at https://algo.monster/problems/amazon-oa-simple-cipher/