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

class Character {
	static boolean equals(char[] c1, char[] c2) {
		Arrays.sort(c1);
		Arrays.sort(c2);
		for (int i = 0; i < c1.length; i++) {
			if (c1[i] != c2[i]) {
				return false;
			}
		}
		return true;
	}
}

public class No_69{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String ans = "";

		char[] c1 = sc.next().toCharArray();
		char[] c2 = sc.next().toCharArray();

		if (Character.equals(c1, c2))
			ans = "YES";
		else
			ans = "NO";

		System.out.println(ans);
		sc.close();

	}
}