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

public class No69 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String a = sc.next();
        String b = sc.next();

        String[] aArray = a.split("");
        String[] bArray = b.split("");

        Arrays.sort(aArray);
        Arrays.sort(bArray);

        if (Arrays.equals(aArray, bArray)) {
            System.out.println("YES");
        } else {
            System.out.println("NO");
        }

        sc.close();
    }

}