why isn't it passing some test cases?

import java.io.; import java.util.; import java.lang.*;

public class Solution {

public static void main(String[] args) {


    int j=0;
    Scanner sc=new Scanner(System.in);
    String A=sc.next();
    String B=sc.next();
    int len=A.length()+B.length();
    System.out.println(len);
    for(int i=0;i<A.length();i++)
        {
         char a=A.charAt(j);
         char b=B.charAt(j);
        if(a>b)
            {
            System.out.println("Yes");
            break;
            }
        else if(a==b)
            {
              j++;
              continue;
            }
          else
              {
              System.out.println("No");
              break;
              }
    /* Enter your code here. Print output to STDOUT. */
         }
      A=A.substring(0,1).toUpperCase()+A.substring(1);
      B=B.substring(0,1).toUpperCase()+B.substring(1);
     System.out.println(A+" "+B);
}

}