import java.util.*;

class Main
{
    public static  void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        
        String s = sc.next();
        String[] array = new String[4];
        
        for (int i = 0; i < 4; i++) {
            array[i] = s.substring(i, i + 1);
        }
        
        //Arrays.sort(array);
        int count = 0;
        
        for (int i = 0; i < 3; i++) {
            if (array[i].equals(array[i + 1])) {
                count++;
            }
        }
        
        if (count != 0) {
            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