import java.util.*;

public class Main {
  public static void main (String[] args) {
    Scanner sc = new Scanner(System.in);

    String[] s = sc.next().split("");

    String ans = "Good";
    if (s[0].equals(s[1])) ans = "Bad";
    if (s[1].equals(s[2])) ans = "Bad";
    if (s[2].equals(s[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