using System;
using System.IO;
using System.Linq;

namespace yukicore
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            var n = Console.ReadLine().ToCharArray();
            var m = Console.ReadLine().ToCharArray();
            Array.Sort(n);
            Array.Sort(m);
            if (new string(n) == new string(m))
                Console.WriteLine("YES");
            else
                Console.WriteLine("NO");
        }
    }
}