using System;
using System.Collections.Generic;
using System.Linq;

public class Program
{
    static void Main()
    {
        string xx = new string(GetChar().ToArray());
        Console.WriteLine(xx);
    }
    
    static IEnumerable<char> GetChar(){
        int Moji = 0;
        int Count = 1;
        char tmp = (char)0;
        while((Moji = Console.Read()) != -1){
            tmp = (char)(( Moji - 65 + 26 - Count)%26 + 65);
            yield return tmp;
            Count = (Count + 1)%26;
        }
    }
}