text: 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 products (product_id VARCHAR, product_price VARCHAR); CREATE TABLE complaints (staff_id VARCHAR, product_id VARCHAR); CREATE TABLE staff (last_name VARCHAR, staff_id VARCHAR)
  ### Question:
  Find the last name of the staff member who processed the complaint of the cheapest product.
  ### Answer:
  SELECT t1.last_name FROM staff AS t1 JOIN complaints AS t2 ON t1.staff_id = t2.staff_id JOIN products AS t3 ON t2.product_id = t3.product_id ORDER BY t3.product_price LIMIT 1