using System;
using System.Linq;

namespace No._69
{
    class Program
    {
        static void Main(string[] args)
        {
            var num1 = Console.ReadLine().ToCharArray().OrderBy(_ => _);
            var num2 = Console.ReadLine().ToCharArray().OrderBy(_ => _);
            Console.WriteLine(num1.SequenceEqual(num2) ? "YES":"NO");
        }
    }
}