import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.Arrays;

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

        String[] A = sc.next().split("");
        String[] B = sc.next().split("");
        Arrays.sort(A);
        Arrays.sort(B);

        for(int i = 0; i < A.length; i++){
            if(!A[i].equals(B[i])){
                System.out.println("NO");
                break;
            }
            if(i == A.length-1){
                System.out.println("YES");
            }
        }

    }
}