import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);
    String s = scan.nextLine();
    char a = s.charAt(0);
    for(int i = 1; i < 4; i++) {
      if (a == (s.charAt(i))) {
        System.out.println("Bad");
        return;
      }
      a = s.charAt(i);
    }
    System.out.println("Good");
    return;
  }
}
  

/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