import java.util.*;
 

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++){
			char temp =S.charAt(i);
			int aa = temp-(i+1);
			char cc;
			if(aa>='A'){
				 cc=(char)aa;
			}else{
				int dd = Math.abs('A'-aa)%26;
				int bb = 'A'+(26-dd)%26;
				cc = (char)bb;
			}
			ans+=cc;
		}
		System.out.println(ans);
	}
}