import java.util.*;
import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void main(String[] args) {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        int num = sc.nextInt();
        num = num + 10000;
        String ans = "Good";
        List<Integer> list = new ArrayList<>();
        while (num > 0) {
            list.add(num % 10);
            num /= 10;
        }
        for(int i =0; i<3; i++){
            if(list.get(i) == list.get(i+1)){
                ans = "Bad";
            }
        }
        System.out.println(ans);
    }
}
/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