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

public class No69 {

    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        String a = s.next();
        String b = s.next();
        char[] aa = a.toCharArray();
        char[] ba = b.toCharArray();
        Arrays.sort(aa);
        Arrays.sort(ba);
        if (Arrays.equals(aa, ba)) {
            System.out.println("YES");
        } else {
            System.out.println("NO");
        }
    }
}