Write a Python program that inputs a single character representing a student's exam grade and checks whether it is a passing letter grade or not.

Your program should work as follows:

• Prompt the user to enter a single character and store it in a suitably named variable.
• Determine if the entered character is an uppercase passing grade between 'A' and 'E' inclusive.
• Output PASS if the character is between 'A' and 'E' inclusive.
• Output FAIL/INVALID if the character is any other value.

You should use meaningful variable name(s), correct Python syntax, and proper indentation in your answer.