import java.util.Scanner;

/**
 * Created by LENOVO on 12/12/2017.
 */
public class Exercise_03_09 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println(" Enter 9 digits of ISBN: ");
        int d1 = sc.nextInt();
        int d2 = sc.nextInt();
        int d3 = sc.nextInt();
        int d4 = sc.nextInt();
        int d5 = sc.nextInt();
        int d6 = sc.nextInt();
        int d7 = sc.nextInt();
        int d8 = sc.nextInt();
        int d9 = sc.nextInt();
        int d10 = ((d1*1 ) + (d2*2) + (d3*3) + (d4*4) + (d5*5) + (d6*6) +(d7*7) + (d8*8) + (d9*9) % 11);

        if (d10 == 10){
                System.out.println("The ISBN-10 number is " +d1+d2+d3+d4+d5+d6+d7+d8+d9+ "X");

        }else{

                System.out.println("The ISBN-10 number is " + d1+d2+d3+d4+d5+d6+d7+d8+d9);




        }

    }
}