import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		String ans = "";
		for(int i = 0 ; i < s.length() ; i++) {
			int a = (s.charAt(i) - 'A' - (i + 1) + 1300) % 26 + 'A';
			char c = (char)a;
			ans += c;
		}
		System.out.println(ans);
 	}
}