Write a Python program that inputs a single character and checks to see if it is a valid uppercase hexadecimal digit representing a value from 10 to 15 (i.e. an uppercase letter between 'A' and 'F' inclusive).

Your program should work as follows:

• Prompts the user to enter a character and stores it in a suitable variable.
• Determines if the entered character is an uppercase letter between 'A' and 'F' inclusive.
• Outputs HEX LETTER if the character is within this range.
• Outputs NOT HEX LETTER if the character is any other character.

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