import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String S = reader.readLine();
        StringBuilder builder = new StringBuilder();
        for (int i = 0; i < S.length(); i++) {
            int N = i + 1;
            builder.append(intToChar(charToInt(S.charAt(i)) - N));
        }
        System.out.println(builder.toString());
    }

    private static int charToInt(char c) {
        return (c - 'A');
    }

    private static char intToChar(int i) {
        i = (i % 26);
        if (i < 0) {
            return (char) ('Z' + i + 1);
        } else {
            return (char) ('A' + i);
        }
    }
}