Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_33 (written_by VARCHAR, production_code VARCHAR)
### Question:
tell me the writer of production code ad1d09.
### Answer:
SELECT written_by FROM table_name_33 WHERE production_code = "ad1d09"