/******************************************************************************

 *  Compilation:  javac CalISBN.java

 *  Execution:    java CalISBN n

 *

 *  Determines the check digit of an ISBN-10 number given the first 9 digits.

 *

 *  An ISBN-10 number is valid if it consists of 10 digits and

 *  d_1 + 2*d_2 + 3*d_3 + ... + 10*d_10 is a multiple of 11.

 *  For example, 0-201-31452-5 is valid since

 *  1*5 + 2*2 + 3*5 + 4*4 + 5*1 + 6*3 + 7*1 + 8*0 + 9*2 + 10*0 = 88

 *  and 88 is a multiple of 11.

 *

 *  % java CalISBN 013407642

 *  The full ISBN number is 0134076427

 *

 *  % java CalISBN 067233784

 *  The full ISBN number is 0672337843

 *

 *  % java CalISBN 032157351

 *  The full ISBN number is 032157351X

 *

 ******************************************************************************/

public class CalISBN {

    public static void main(String[] args) { 

        // read in one command-line argument

        int n = Integer.parseInt(args[0]);

        // compute the weighted sum of the digits, from right to left

        int sum = 0;

        for (int i = 2; i <= 10; i++) {

            int digit = n % 10;                // rightmost digit

            sum = sum + i * digit;

            n = n / 10;

        }

        // print out check digit, use X for 10

        System.out.print("The full ISBN number is " + args[0]);

        if      (sum % 11 == 1) System.out.println("X");

        else if (sum % 11 == 0) System.out.println("0");

        else                    System.out.println(11 - (sum % 11));

    }

}