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

namespace No18
{

	class MainClass
	{
		public static void Main (string[] args)
		{
			var line = Console.ReadLine ();

			List<char> outputs = new List<char> ();

			for (int i = 0; i < line.Length; i++) {
				char c = (char)(line[i] - 'A' + 25);
				c -= (char)(i % 26);
				c = (char)(c % 26);
				char ch = (char)(c + 'A');
				outputs.Add (ch);
			}
			foreach (var element in outputs) {
				Console.Write (element);
			}
			Console.WriteLine();
		}
	}
}