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


public class Main {
	public static void main(String[] a) {
		Scanner s=new Scanner(System.in);
		char[] A=s.nextLine().toCharArray(),B=s.nextLine().toCharArray();
		Arrays.sort(A);Arrays.sort(B);
		System.out.println(Arrays.equals(A,B)?"YES":"NO");
	}
}