package no069;

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

public class Main {

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

}