using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;

namespace PencilCode
{
    class Program
    {
        static void Main(string[] args)
        {
            Dictionary<char, int> chars = new Dictionary<char, int>
            {
                {'A', 0x41},
                {'B', 0x61},
                {'C', 0x31},
                {'D', 0x42},
                {'E', 0x43},
                {'F', 0x32},
                {'G', 0x51},
                {'H', 0x33},
                {'I', 0x34},
                {'J', 0x35},
                {'K', 0x36},
                {'L', 0x21},
                {'M', 0x44},
                {'N', 0x37},
                {'O', 0x45},
                {'P', 0x46},
                {'Q', 0x52},
                {'R', 0x53},
                {'S', 0x54},
                {'T', 0x22},
                {'U', 0x38},
                {'V', 0x23},
                {'W', 0x47},
                {'X', 0x24},
                {'Y', 0x25},
                {'Z', 0x39},
                {'0', 0x48},
                {'1', 0x26},
                {'2', 0x55},
                {'3', 0x56},
                {'4', 0x3A},
                {'5', 0x57},
                {'6', 0x58},
                {'7', 0x3B},
                {'8', 0x62},
                {'9', 0x59}
            };

            var magic = "83cd09c9cb593d5bf871e8d71035b4a7";

            while (true)
            {
                var text = Console.ReadLine().ToUpper();
                if(text.Length < 3)
                {
                    Console.WriteLine("Invalid input!");
                    continue;
                }
                var result = string.Concat(
                    (from c in text
                     select (chars.ContainsKey(c) ? chars[c] : Encoding.ASCII.GetBytes(c.ToString())[0])).Select(
                         (t, i) => int.Parse(magic[i % 32].ToString(), NumberStyles.HexNumber) * t).Select(x => x.ToString("x")));

                var even = result.Where((t, i) => i % 2 == 0).Reverse();
                var odd = result.Where((t, i) => i % 2 != 0);


                Console.WriteLine(string.Concat(even) + string.Concat(odd));
            }
        }
    }
}