import java.util.*;
public class Main {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
    String s = sc.next();
    
    String first = s.substring(0,1);
    String second = s.substring(1,2);
    String third = s.substring(2,3);
    String fourth = s.substring(3,4);
    
    if (first.equals(second)) {
      System.out.println("Bad");
    } else if (second.equals(third)) {
      System.out.println("Bad");
    } else if (third.equals(fourth)) {
      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