import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        final String s = sc.next();
        char[] ans = new char[s.length()];

        for (int i = 0; i < s.length(); i++) {
            int c = s.charAt(i) - (i + 1);
            c = c - 'A';
            //c = c  % 26;
            //ans[i] = (char) (((c + 26) % 26) + 'A');
            ans[i] = (char) (c + 'A');
        }

        System.out.println(new String(ans));
    }

}