Write a program that does the following:
1) Ask the user to -- Enter 'b' for bird or 'm' for mammal:
2) Validate that input to allow only b, B, m, or M
3) Print "That is not a valid input" if an incorrect value was entered and have the user re-enter the input
4) Upon successful input, display "You chose bird" or "You chose mammal" depending on their input.