import java.util.Scanner;

class Main {
    public static void main(final String[] args) {
        Scanner scan = new Scanner(System.in);
        String s = scan.nextLine();
        int cnt = 0;
        for (int i = 0; i < 3; i++) {
            if (s.charAt(i) == s.charAt(i+1)) {
                cnt++;
            }
        }
        System.out.println(cnt > 0? "Bad":"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