import java.util.*;
public class Main {
    public static void main(String[] args) throws Exception {
        Scanner koko = new Scanner(System.in);
        String a = koko.next();
        String b = koko.next();
        char[] ah = a.toCharArray();
        char[] bh = b.toCharArray();
        Arrays.sort(ah);
        Arrays.sort(bh);
        String an = String.valueOf(ah);
        String bn = String.valueOf(bh);
        if(an.equals(bn)){
            System.out.println("YES");
        }else{
            System.out.println("NO");
        }
    }
}