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

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String A = sc.next();
		String B = sc.next();
		sc.close();
		char[] chA = A.toCharArray();
		char[] chB = B.toCharArray();
		Arrays.sort(chA);
		Arrays.sort(chB);
		if(Arrays.equals(chA, chB)){
			System.out.println("YES");
		}else{
			System.out.println("NO");
		}
 	}// mainmethod

} // class