package no018;

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		char[] s = sc.next().toCharArray();
		int n = s.length;
		for(int i=0;i<n;i++) {
			s[i] = (char) ((((s[i] - 'A') + 26 * 100 - (i+1))%26) + 'A');
		}
		System.out.println(String.valueOf(s));
	}

}