using System;
namespace test9002
{
    class Program
    {
        public static readonly int alphaCount = 26;
        public static readonly char[] alphas = new char[26] { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };

        static void Main()
        {
            var arg = Console.ReadLine().Trim();
            char tempChar = 'a';
            int charOrder = 0;
            string outputWord = "";
            int reverseCount = 0;
            for (int i = 0; i < arg.Length; i++)
            {
                tempChar = arg[i];
                charOrder = Array.IndexOf(alphas, tempChar);
                reverseCount = (i + 1) % alphaCount;
                if ((charOrder - reverseCount) >= 0)
                {
                    outputWord += alphas[charOrder - reverseCount];
                }
                else if ((charOrder - reverseCount) < 0)
                {
                    outputWord += alphas[charOrder - reverseCount + 26];
                }
                else
                {
                    outputWord += tempChar;
                }
            }
            Console.WriteLine(outputWord);
        }
    }
}