import java.io.*;
import java.util.*;

public class Main {

    public static void main(String[] args) throws IOException {
        InputStream inputStream = System.in;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(System.out);

        char[] n = in.next().toCharArray();
        for (int i = 1; i < n.length; i++) {
            if (n[i] == n[i - 1]) {
                out.println ("Bad");
                out.close();
                System.exit(0);
            }
        }
        out.println("Good");
        out.close();
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz