using System;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        // No.18 うーさー暗号

        string s = Console.ReadLine();
        if (s.Length >= 1023) return;

        int shift = -1;
        int ascii = 0;
        foreach (var item in s.Select((val, idx) => new { val, idx }))
        {
            ascii = (int)item.val + (shift * (item.idx + 1));

            do
            {
                if (ascii <= 64) ascii += 26;
                if (ascii >= 91) ascii -= 26;
            } while (ascii <= 64 || 91 <= ascii);

            Console.Write((char)ascii);
        }

        Console.WriteLine();
    }
}