using System;
using System.Linq;
using System.Text;

namespace TestBench
{

	internal class Program
	{
		internal static void Main()
		{
			var array = Enumerable.Range(0x41, 26).Select(x => (char) x).ToArray();

			Console.WriteLine(Console.ReadLine().Select((c, i) => new {value = c - 0x41, offset = (i + 1)%26})
				.Select(x => x.value - x.offset).Select(x => x < 0 ? 26 + x : x).Select(x => array[x])
				.Aggregate(new StringBuilder(), (bld, c) => bld.Append(c), bld => bld.ToString()));
		}
	}
}