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_27911342_1 ( season__number VARCHAR, written_by VARCHAR )

### Question ###
What is the season number of the show written by both Kari Lizer and Jeff Astrof?

### Accurate SQL ###

SELECT COUNT(season__number) FROM table_27911342_1 WHERE written_by = "Kari Lizer"