import java.util.Scanner;
import java.util.List;
import java.util.ArrayList;
import java.util.Objects;

public class Main {
  public static void main(String[] args ){

    Scanner sc = new Scanner(System.in);

    String S = sc.next();

    boolean repetNum = false;
    for (int i = 0; i < S.length() - 1; i++) {
      if(S.charAt(i) == S.charAt(i + 1)) repetNum = true;
    }

    System.out.println(repetNum ? "Bad" : "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