Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_27547668_4 ( original_airdate VARCHAR, written_by VARCHAR )

### Question ###
what is the number of original airdate written by allan hawco?

### Accurate SQL ###

SELECT COUNT(original_airdate) FROM table_27547668_4 WHERE written_by = "Allan Hawco"