import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner teclado = new Scanner(System.in);
        String s = teclado.next();
        Boolean check = false;
       for(int x = 0; x < 3; x++){
           if(s.charAt(x) == s.charAt(x+1)){
                check = true;
                break;
   }
       }
       if(check){
           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