import java.util.Arrays;
import java.util.Scanner;

public class Yuki017 {
    public static void main(String[] args) {
        Yuki017 p = new Yuki017();

    }

    public Yuki017() {
        Scanner scanner = new Scanner(System.in);
        final String s = scanner.next();
        char[] ans = new char[s.length()];
        for (int i = 0; i < s.length(); i++) {
            int c = (s.charAt(i) - (i + 1) - 'A') % 26;
            ans[i] = (char) (((c + 26) % 26) + 'A');
        }
        System.out.println(new String(ans));
    }

}