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_2226817_8 (written_by VARCHAR, no_in_season VARCHAR)
### Question:
Who is the writer of episode 13?
### Answer:
SELECT COUNT(written_by) FROM table_2226817_8 WHERE no_in_season = 13