class Main {
    public static void main(String[] args) {
        java.util.Scanner stdInputScanner = new java.util.Scanner(System.in);

        String str = stdInputScanner.next();
        String output;

        if (str.matches(".*(.)\\1.*")) {
            output = "Bad";
        } else {
            output = "Good";
        }

        System.out.println(output);
    }
}
/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