using System;
using System.Collections.Generic;
namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
#if LocalDebug
            var exStdIn = new System.IO.StreamReader("stdin.txt");
            System.Console.SetIn(exStdIn);
#endif
            var Input = Console.ReadLine();
            for (int i = 0; i < Input.Length; i++)
            {
                Console.Write(ShiftRight(Input[i], i % 26 + 1));
            }


#if LocalDebug
            System.Console.ReadKey();
#endif
        }

        static char ShiftRight(char c, int shift)
        {
            var a = (char)(c - shift);
            if (a < 'A')
                a = (char)('Z' + 1 - ('A' - a));
            return a;
        }



        static int GetData()
        {
            return int.Parse(Console.ReadLine());
        }

        static string[] GetList()
        {
            return Console.ReadLine().Split(' ');
        }



    }
}