using System;
namespace yukicoder
{
    class Program
    {

        static void Main(string[] args)
        {
            var S = Console.ReadLine();
            var T = Console.ReadLine();
            string str , str2;
            int i, j;
            var x = S.Split();
            var y = T.Split();
            string[] A = new string[S.Length];
            string[] B = new string[T.Length];
            //文字分割
            if(S.Length == T.Length)
            {
                for (i = 0; i <= S.Length - 1; i++)
                {
                    A[i] = x[0].Substring(i, 1);
                }

                for (j = 0; j <= T.Length - 1; j++)
                {
                    B[j] = y[0].Substring(j, 1);

                }
            }
            Array.Sort(A);
            Array.Sort(B);
            for(int f = 0; f < A.Length; f++)
            {
                if (A[f].Equals(B[f]))
                {
                    if (f == A.Length - 1)
                    {
                        Console.WriteLine("YES");
                    }
                }
                else
                {
                    Console.WriteLine("NO");
                    break;
                }
            }
           

        }
    }
}