import java.util.Scanner;

public class No18 {

    static final String ALPHABETS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();

        String result = "";

        for (int i = 0; i < s.length(); i++) {
            int codeId = ALPHABETS.indexOf(s.charAt(i));

            int decodeId = (codeId - (i + 1)) % ALPHABETS.length();

            if (decodeId < 0) {
                decodeId += ALPHABETS.length();
            }

            result += ALPHABETS.charAt(decodeId);
        }

        System.out.println(result);

        sc.close();
    }

}