package yukicoder;

import java.util.Scanner;

public class No018 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.nextLine();
		sc.close();
		for (int i = 1; i <= S.length(); i++) {
			int m = i;
			if(m > 26){
				m %= 26;
			}
			String ss = S.substring(i - 1, i);
			char c = (char)(ss.charAt(0) - m);
			if (c <= '@') {
				c += 26;
			}
			System.out.print(c);
		}
		System.out.println();
	}
}