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 Lessons (staff_id VARCHAR); CREATE TABLE Staff (staff_id VARCHAR, first_name VARCHAR)
  ### Question:
  How many lessons taught by staff whose first name has letter 'a' in it?
  ### Answer:
  SELECT COUNT(*) FROM Lessons AS T1 JOIN Staff AS T2 ON T1.staff_id = T2.staff_id WHERE T2.first_name LIKE "%a%"