import java.util.Scanner;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
    String S = sc.next();
    String[] splitArray = S.split("");
    String kekka = "Good"; 
    
    for(int i=0;i<splitArray.length-1;i++){
      if(splitArray[i].equals(splitArray[i+1])){
        kekka = "Bad";
      }
    }
    
    System.out.println(kekka);
  }



}
/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