using System;
public class Program
{
    static void Main()
    {
        char[] s = Console.ReadLine().ToCharArray();
        for (int i = 0; i < s.Length; i++)
        {
            int c = s[i];
            c -= 'A';
            c += (i / 26 + 1) * 26;
            s[i] = (char)((c - (i + 1)) % 26 + 'A');
        }
        Console.WriteLine(new String(s));
    }
}