import java.util.Scanner;

public class Main {

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    char[] pin = sc.next().toCharArray();
    if (pin[0] == pin[1]) {
      System.out.println("Bad");
      return;
    }
    if (pin[1] == pin[2]) {
      System.out.println("Bad");
      return;
    }
    if (pin[2] == pin[3]) {
      System.out.println("Bad");
      return;
    }
    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