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();

		char[]a=A.toCharArray();
		char[]b=B.toCharArray();

		Arrays.sort(a);
		Arrays.sort(b);

		if(Arrays.equals(a, b)) {
			System.out.println("YES");
		}
		else {
			System.out.println("NO");
		}


	}

}