import java.util.Scanner;

public class Main {

  public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);

    String s = sc.next();

    if ((s.charAt(0) == s.charAt(1)) || (s.charAt(1) == s.charAt(2)) || (s.charAt(2) == s.charAt(3))) {
      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