Function

Question

I want to make a function that takes in a number, and returns the attached letter. Example 0 = F and 5 = A
If over 5, the function returns not valid. Any tips to how one would do this?

Answer 1

How 0 = F ?

Answer 2

Lets say I print a number using input, if I then print in 5, I want the fuction to return F

Answer 3

0*