using System;

public class Program {
    public static void Main() {
        int[,] count = new int[2, 26];
        for (int i = 0; i < 2; i++) {
            for (int j = 0; j < 26; j++) {
                count[i, j] = 0;
            }
        }
        for (int i = 0; i < 2; i++) {
            string str = Console.ReadLine();
            for (int j = 0; j < str.Length; j++) {
                count[i, str[j]-'a']++;
            }
        }
        for (int i = 0; i < 26; i++) {
            if (count[0, i] != count[1, i]) {
                Console.WriteLine("NO");
                return;
            }
        }
        Console.WriteLine("YES");
    }
}