import java.util.*;
import java.lang.*;

class Main{
    
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        boolean T = true;
        for(int i = 0 ; i < S.length()-1 ; i++){
            if(S.substring(i, i+1).equals(S.substring(i+1, i+2))){
                System.out.println("Bad");
                T = false;
                break;
            }
            
        }
        if(T){
            System.out.println("Good");
        }

        sc.close();

    }

}

/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