using System;

public class Program {
	public static void Main(string[] args) {
		char[] c = Console.ReadLine().ToCharArray();
		string s = "";
		for (int i = 0; i < c.Length; i++) {
			int code = (int)c[i] - i % 26 - 1;
			if (code < 65) {
				code = 90 - 64 + code;
			}
			s += (char)code;
		}
		Console.WriteLine(s);
	}
}