Other checksums challenge 1.2 Calculate the last digit of a credit card number (one line of input)

Instructions

This program asks the user to enter the first 15 digits of a credit card number as the input and says what the last digit should be as the output. Some test credit card numbers: Input: 510510510510510 The last digit of the credit card should be: 0 Input: 411111111111111 The last digit of the credit card should be: 1 401288888888188 The last digit of the credit card should be: 1