import java.util.Scanner;
 
class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
    String s = sc.nextLine();
    String result = "Good";
    String[] split = s.split("",0);
    for(int i = 0;i < 3;i++){
        if(split[i].equals(split[i+1])){
          result = "Bad";
        }
    }
      System.out.println(result);
  }
}
/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