import java.util.Scanner;

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

    char[] s = scanner.next().toCharArray();
    boolean good = true;
    for (int i = 0; i < s.length - 1; i++) {
      if (s[i] == s[i + 1]) good = false;
    }
    if (good) System.out.println("Good");
    else System.out.println("Bad");
  }
}

/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