class Program
    {
        static void Main(string[] args)
        {
            string numberAsString = Console.ReadLine();

            var result = new string(numberAsString.Select((ch, index) => new { ch, index })
                                         .OrderByDescending(x => x.index)
                                         .Select(x => x.ch)
                                         .ToArray());
            Console.WriteLine(result);
        }
    }