using System;
using System.Text;
using System.Linq;
using System.IO;
namespace N
{
    class P
    {
        static void Main()
        {
            string CSL = Console.ReadLine();
            StringBuilder Sb = new StringBuilder();
            int lng = CSL.Length;
            for (int i = 0; i < lng; i ++)
            {
                int n = CSL[i]+ 2535;
                n -= i+1;
                n = n % 26;
                n += 65;
                Sb.Append((char)n);
            }
            Console.WriteLine(Sb.ToString());
            Console.ReadKey();
        }
        
    }
}