what is the number of original airdate written by allan hawco?
CREATE TABLE table_27547668_4 (
    original_airdate VARCHAR,
    written_by VARCHAR
)
SELECT COUNT(original_airdate) FROM table_27547668_4 WHERE written_by = "Allan Hawco"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: what is the number of original airdate written by allan hawco? ### Input: CREATE TABLE table_27547668_4 (
    original_airdate VARCHAR,
    written_by VARCHAR
) ### Response: SELECT COUNT(original_airdate) FROM table_27547668_4 WHERE written_by = "Allan Hawco"