import java.util.*;

public class Main {
    public static void main(String args[]){
        Scanner scanner = new Scanner(System.in);
        String a = scanner.nextLine();
        boolean t = true;

        for(int i = 0;i < a.length()-1;i++){
            if (a.charAt(i) == a.charAt(i + 1)) {
                t = false;
                break;
            }
        }
        
        if (t) {
            System.out.println("Good");
        }else{
            System.out.println("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