in Python

Program I/O. Input: one letter from the console keyboard. Output: Your identifying information, and either "You pass", "You do not pass", or "Invalid entry", to the console screen.

Examples (3). Here's what the output should look like, with user input in blue: What is your grade? [A, B, C, D, or F]: X

No, that's an invalid entry 

What is your grade? [A, B, C, D, or F]: F Yikes -- you failed... 

What is your grade? [A, B, C, D, or F]: A Really execllent work!