package yukicoder;

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

public class Yuki69 {
	
	public static void main(String args[]) {
		
		Scanner scan = new Scanner(System.in);
		String A = scan.next();
		String B = scan.next();
		scan.close();

		char[] a = A.toCharArray();
		Arrays.sort(a);
		A = String.valueOf(a);
		
		char[] b = B.toCharArray();
		Arrays.sort(b);
		B = String.valueOf(b);
		
		if (A.equals(B)) {
			System.out.println("YES");
		} else {
			System.out.println("NO");
		}
	}
}