using System;

public class Hello
{
    public static void Main()
    {
        var s = Console.ReadLine().Trim();
        var s2 = Console.ReadLine().Trim();
        Console.WriteLine(sortS(s) == sortS(s2) ? "YES" : "NO");
    }
    public static string sortS(string s)
    {
        var a = s.ToCharArray();
        Array.Sort(a);
        return new string(a);
    }
}