import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		
		String S = in.next();
		
		String ans = "";
		for (int i = 1; i <= S.length(); i++) {
			int d = S.charAt(i-1) - 'A';
	        d += 2600;
	        d -= i;
	        d %= 26;
	        ans += (char)('A' + d);
		}
		System.out.println(ans);
	}
}