two_digit_number = int(input("Type a two digit number: "))

while two_digit_number != 100:
    if two_digit_number >100:
        print("please type a two digit number")
else:
        first_digit = two_digit_number[0]
        second_digit =             two_digit_number[1]
    two_digit_number = first_digit + second_digit
    print(two_digit_number)

two_digit_number = int(input("Type a two digit number: "))