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


namespace StartFinish
{
    class Program
    {
        static void Main(string[] args)
        {
            var charArray = Console.ReadLine().ToCharArray();

            var length = charArray.Length;

            for (int i = 0; i < length; i++)
            {
                charArray[i] -= (char)((i + 1) % 26);
                if (charArray[i] < 'A')
                {
                    charArray[i] = (char)(charArray[i] + 26);
                }
            }
            foreach(var c in charArray)
            {
                Console.Write(c);
            }
            Console.WriteLine();
        }

    }
}