import java.util.Scanner;

public class Main {
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        String code = sc.nextLine().replace("\n", "");
        sc.close();

        for (int i = 1; i < code.length(); i++) {
            if (code.charAt(i - 1) == code.charAt(i)) {
                System.out.println("Bad");
                System.exit(0);
            }
        }
        System.out.println("Good");
    }
}

/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