import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String a = sc.next();
        boolean isBad = false;
        for (int i = a.length() - 1; i >= 1; i--) {
            if (a.charAt(i) == a.charAt(i - 1)) isBad = true;
        }
        
        if (isBad) {
            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