import java.util.Scanner;
import java.util.Arrays;
public class no69{
    public static void main(String... args){
        
        Scanner scan = new Scanner(System.in);
        String a = scan.next();
        String b = scan.next();
        
        String a1[] = a.split("");
        String b1[] = b.split("");
        
        Arrays.sort(a1);
        Arrays.sort(b1);
        int res = 0;
        for(int i = 0; i < a.length(); i++){
            if(a1[i].equals(b1[i])){
                res++;
            }
        }

        System.out.println((res == a.length())?"YES":"NO");
    }
}