import java.util.Scanner;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    char[] chars = sc.next().toCharArray();
    String status = "Good";
    for(int i=1; i<chars.length; i++){
      if(chars[i-1]==chars[i]){
        status = "Bad";
      }
    }
    System.out.println(status);
  }
}
/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