import java.io.*;
    class Prog1
    {
     BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
       String str;
       int digit,c=1,x=0,i,len;
       char ch;
       public void show()throws Exception
       {
        System.out.println("Enter the ISBN code:");
        str=br.readLine();
        len=str.length();
        if(len!=10)
        {
         System.out.println("Invalid input.");
        return;
        }
       for(i=len-1;i>=0;i--)
       {
         ch=str.charAt(i);
         if(ch=='X')
         digit=10;
         else
         digit=ch-48;
         x=x+digit*c;
         c++;
         }
         System.out.println("nSum="+x);
         if(x%11==0)
         System.out.println("Leaves no remainder - valid ISBN code.");
         else
         System.out.println("Leaves remainder - invalid ISBN code.");
         }
         public static void main(String args[]) throws Exception
         {
          Prog1 ob=new Prog1();
          ob.show();
          }
          }