import java.util.*;

public class  Main{
    public static void main(String... args) {
        Scanner sc = new Scanner(System.in);

        String userInput = sc.nextLine();

        String[] splitedUserInput = userInput.split("");
        String resultCd = "Good";
        for(int i = 0; i < splitedUserInput.length - 1; i++){
            if(splitedUserInput[i].equals(splitedUserInput[i+1])){
                resultCd = "Bad";
            }
        }

        System.out.println(resultCd);
    }
}
/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