using System;
using System.Collections.Generic;
using System.Linq;
using static System.Console;

class Program
{
    static void Main()
    {
        var A = ReadLine();
        var B = ReadLine();
        var a = A.ToArray();
        var b = B.ToArray();
        Array.Sort(a);
        Array.Sort(b);
        WriteLine(string.Join("", a) == string.Join("", b) ? "YES" : "NO");
    }
}