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

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		char[] s1 = sc.next().toCharArray();
		char[] s2 = sc.next().toCharArray();
		Arrays.sort(s1); Arrays.sort(s2);
		System.out.println(Arrays.equals(s1, s2) ? "YES" : "NO");
 	}
}