I need help on what im doing wrong

The error is that you're trying to convert a string with letters inside into an int. What happens if a user type in 'a' instead of '1'? 'a' is not a number so the int('a') would fail and give you an error. Make you add a line to check whether the input a number or not.

Explanation:

Change your code to

DEorAP  = input("Is it AP or DE?")

if DEorAP.isdigit()

  DEorAP = int(DEorAP)

answerfc- file compare;