import java.util.*;

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

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

    for (int i = 0; i < 3; i++) {
      String current = sList[i];
      String next = sList[i+1];

      if(current.equals(next)) {
        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