import java.util.*;
public class Main{
	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
      String str = sc.next();
      String x1 = str.substring(0,1);
      String x2 = str.substring(1,2);
      String x3 = str.substring(2,3);
      String x4 = str.substring(3,4);
      if(x1.equals(x2)||x2.equals(x3)||x3.equals(x4))
        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