using System;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        char[] A = Console.ReadLine().ToCharArray();
        char[] B = Console.ReadLine().ToCharArray();

        Array.Sort(A);
        Array.Sort(B);

        string strA = new string(A);
        string strB = new string(B);

        Console.WriteLine(strA.Equals(strB) ? "YES" : "NO");
    }
}