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();

    int sizeA = A.length();
    int sizeB = B.length();
    int sum = sizeA + sizeB;

    String capitalA = "", capitalB = "";
    boolean isLexicographically = true;

    // Check lexicographical order
    if (A.compareTo(B) > 0) {
        isLexicographically = false;
    }

    // Capitalize the first letter of both strings
    capitalA = A.substring(0, 1).toUpperCase() + A.substring(1);
    capitalB = B.substring(0, 1).toUpperCase() + B.substring(1);

    // Output results
    System.out.println(sum);
    if (isLexicographically) {
        System.out.println("No");
    } else {
        System.out.println("Yes");
    }
    System.out.println(capitalA + " " + capitalB);
}

}