using System;
using System.Linq;

namespace App
{
    class Program
    {
        static void Main(string[] args)
        {
            var a = Console.ReadLine().OrderBy(x => x).ToArray();
            var b = Console.ReadLine().OrderBy(x => x).ToArray();
            string aa = new string(a);
            string bb = new string(b);
            if (aa == bb)
            {
                Console.WriteLine("YES");
            }
            else
            {
                Console.WriteLine("NO");
            }
        }
    }
}