import java.util.*;
public class Main{
public static void main(String[]args){
Scanner sc=new Scanner(System.in);
String po=sc.next().replace("11","").replace("22","").replace("33","").replace("44","").replace("55","").replace("66","").replace("77","").replace("88","").replace("99","").replace("00","");
  System.out.println((po.length()==4)?"Good":"Bad");
}
}
/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