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

namespace YukiCoder
{
    class Program
    {
        static void Main(string[] args)
        {
            var vs = Console.ReadLine();
            var va = vs.Select((c, i) => (char)((c - 'A' + 26 - (i + 1) % 26) % 26 + 'A'));
            Console.WriteLine(new string(va.ToArray()));
        }
    }
}