using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;

namespace CodeIq
{
	internal class Program
	{
		private static void Main()
		{
			var a = Console.ReadLine();
			var b = Console.ReadLine();
			//var a = "hurjztkyua";
			//var b = "urjukzthua";

			var aArray = a.ToCharArray();
			var bArray = b.ToCharArray();
			Array.Sort( aArray );
			Array.Sort( bArray );

			Console.WriteLine( new string( aArray ) == new string( bArray ) ? "YES" : "NO" );
		}
	}
}