import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class Main {


    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String A = reader.readLine();
        String B = reader.readLine();

        int[] as = new int[26];
        for (int i = 0; i < A.length(); i++) {
            as[A.charAt(i) - 'a'] += 1;
        }
        int[] bs = new int[26];
        for (int i = 0; i < B.length(); i++) {
            bs[B.charAt(i) - 'a'] += 1;
        }
        if(isSame(as,bs)) {
            System.out.println("YES");
        } else {
            System.out.println("NO");
        }

    }

    private static boolean isSame(int[] as, int[] bs) {
        for (int i = 0; i < 26; i++) {
            if (as[i] != bs[i]) {
                return false;
            }
        }
        return true;
    }


}