import java.util.*;
 
public class Main {
  public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    String str = in.nextLine();
	in.close();
    String ans = "Good";
    if (str.charAt(0) == str.charAt(1) || str.charAt(1) == str.charAt(2) || str.charAt(2) == str.charAt(3)) {
      ans = "Bad";
    }
    System.out.println(ans);
  }
}
/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