It is 12:00 PM mock interview. The peer worked on the algorithm called Decrypt the message. I noticed something is different. The way the peer presented the algorithm is so clear and then I know that I met a very talent programmer.
I also joined the analysis of the algorithm with the peer. We talked about the difference between those numbers on line 8 and line 9.
Here is the analysis and python code. The peer managed to pass all test cases.