/**
 * Created by nullzine on 2017/01/11.
 */
public class Main {

    public static void main(String[] args) {
        System.out.println(new Main().decode(new java.util.Scanner(System.in).nextLine()));
    }

    private String decode(String str) {
        StringBuilder ret = new StringBuilder();
        for (int i = 0; i < str.toCharArray().length; i++) {
            char c = str.charAt(i);
            for (int j = 0; j < i + 1; j++) {
                c--;
                if (c == '@') {
                    c = 'Z';
                }
            }
            ret.append(c);
        }
        return ret.toString();
    }

    private String encode(String str) {
        StringBuilder ret = new StringBuilder();
        for (int i = 0; i < str.toCharArray().length; i++) {
            char c = str.charAt(i);
            for (int j = 0; j < i + 1; j++) {
                c++;
                if (c == '[') {
                    c = 'A';
                }
            }
            ret.append(c);
        }
        return ret.toString();
    }

}