import java.util.Arrays;
import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String a = scan.next();
        String b = scan.next();
        char[] arrA = a.toCharArray();
        char[] arrB = b.toCharArray();
        Arrays.sort(arrA);
        Arrays.sort(arrB);
        String strA = String.valueOf(arrA);
        String strB = String.valueOf(arrB);
        if (strA.equals(strB)) {
            System.out.println("YES");
        } else {
            System.out.println("NO");
        }
        scan.close();
    }
}