Write code that a string from the user and a letter, and returns a new string where each instance of the letter becomes a Q. You will return the string in BACKWARDS order! For example, happybirthday and a yield the result yqdhtribyppqh. Please do this in Python 2.7

Here is what I have so far, a link to the Visualizer

https://goo.gl/qQh9TG

Here are test cases that the code MUST pass!

replace bird c drib replace bird i drQb replace birid i dQrQb replace ibirdi i QdrQbQ