import java.util.*;
class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.nextLine();
        if(search(S)) System.out.println("Bad");
        else System.out.println("Good");
        sc.close();
    }

    static boolean search(String s) {
        for(int i = 1; i < 4; i++) {
            char a = s.charAt(i-1);
            char b = s.charAt(i);
            if(a == b) return true;
        }
        return false;
    }
}
/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