import java.io.; import java.util.;

public class Solution {

public static void main(String[] args) {

    Scanner sc=new Scanner(System.in);
    String A=sc.next();
    String B=sc.next();
    /* Enter your code here. Print output to STDOUT. */
    int len = A.length()+B.length();
    String s = "No";
    if(A.compareTo(B)>0){
        s = "Yes";
    }
    String capA = A.substring(0,1).toUpperCase();
    String capB = B.substring(0,1).toUpperCase();
    System.out.printf("%d\n%s\n%s %s", len,s,capA+A.substring(1),capB+B.substring(1));
    sc.close();
}

}