import java.util.*;

public class Main {

    public static List<List<Integer>> switchList;

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        sc.close();

        boolean isBad = false;
        char last = Character.MIN_VALUE;
        for (int i = 0; i < S.length(); i++) {
            char a = S.charAt(i);
            if (a == last) {
                isBad = true;
                break;
            }
            last = a;
        }
        if (isBad) {
            System.out.println("Bad");
        } else {
            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