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_9 (district VARCHAR, city_area_km_2__ VARCHAR, serial_no VARCHAR)
### Question:
What district was the city with an area smaller than 12 square kilometers and a serial number of 35?
### Answer:
SELECT district FROM table_name_9 WHERE city_area_km_2__ < 12 AND serial_no = 35