using System;
using System.Linq;

public class Program
{
	static void Main()
	{
		var CharList = Console.ReadLine().ToCharArray().ToList<char>();

		for (int i = 0; i < CharList.Count; i++)
		{
			Console.Write(Convert.ToChar(Convert.ToInt32(CharList[i]) - (i + 1 % 26)));
		}

		Console.WriteLine();
	}
}