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[] Aarr = A.split("");
		String[] Barr = B.split("");

		Arrays.sort(Aarr);
		Arrays.sort(Barr);

		String re = "YES";
		for (int i = 0; i < Aarr.length; i++) {
			if(!Aarr[i].equals(Barr[i])) {
				re = "NO";
				break;
			}
		}

		System.out.println(re);

	}

}