using System;
using System.Diagnostics;
public class Program
{
    public static void Main()
    {
        //int turn = int.Parse(Console.ReadLine() ?? string.Empty);
        //string[] num = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        string str = Console.ReadLine() ?? string.Empty;

        string alph = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        string change = "";
        for(int i = 0; i < str.Length; i++)
        {
            int index = alph.IndexOf(str[i]);
            if(index - (i+1) < 0)
            {
                int aa = alph.Length + (index - (i + 1));
                while (aa < -26)
                {
                    aa = alph.Length + aa;
                }

                if(aa >= 0)
                {
                    change += alph[aa];
                }
                else
                {
                    change += alph[alph.Length + aa];

                }
            }
            else
            {
                change += alph[index - i-1];
            }

        }
        Console.WriteLine(change);

    }
}