def verify_isbn(isbn):
    count = 10
    isbn_numbers = 0
    for num in isbn:
        if num != '-' and count >= 2:
            first_result = int(num) * count
            isbn_numbers = isbn_numbers + first_result
            count -= 1
    new_result = isbn_numbers % 11
    new_result = 11 - new_result
    
    final_result = new_result % 11
    print final_result #this prints ok
    print isbn[-1] #this is where my problem is