import java.util.Scanner;
 
public class Main{
	public static void main(String[] args){
    	
      Scanner scan = new Scanner(System.in);
      String a = scan.next();
      if (a.charAt(0) == a.charAt(1) || a.charAt(1) == a.charAt(2) || a.charAt(2) == a.charAt(3)){
        System.out.print("Bad");
      }else{
        System.out.print("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