import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String A = sc.next();
        String [] arr1 = A.split("");
        Arrays.sort(arr1);
        String a = "";
        for(int i=0; i<arr1.length; i++){
             a = a + arr1[i];
        }

        String B = sc.next();
        String [] arr2 = B.split("");
        Arrays.sort(arr2);
        String b = "";
        for(int i=0; i<arr2.length; i++){
             b = b + arr2[i];
        }

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


    }
}