import java.util.*;

public class Main {
 
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        char tmp = s.charAt(0);
        boolean isGood = true;
        for (int i = 1; i < s.length(); i++) {
            if (tmp == s.charAt(i)) {
                isGood = false;
            }
            tmp = s.charAt(i);
        }
        System.out.println(isGood ? "Good" : "Bad");
    }
}
/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