using System;

class Program
{
    static void Main(string[] args)
    {
        var a = Console.ReadLine();
        var b = Console.ReadLine();
        
        if (Check(a, b))
        {
            Console.WriteLine("YES");
        }
        else
        {
            Console.WriteLine("NO");
        }
    }
    
    static bool Check(string a, string b)
    {
        var aArrays = a.ToCharArray();
        var bArrays = b.ToCharArray();
        Array.Sort(aArrays);
        Array.Sort(bArrays);

        if (new string(aArrays) == new string(bArrays)) return true;
        return false;
    }
}