    import java.util.*;
     
    public class Main{
          public static void main(String[] args) {
                Scanner sc = new Scanner(System.in);
                String str = sc.next();
                String[] str2 = str.split("");
                if(str2[0].equals(str2[1]) || str2[1].equals(str2[2]) || str2[2].equals(str2[3])){
                  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