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_name_81 (county VARCHAR, ihsaa_football_class VARCHAR, size VARCHAR)

### Question ###
What county has a school with less than 301 students and plays IHSAA class A football?

### Accurate SQL ###

SELECT county FROM table_name_81 WHERE ihsaa_football_class = "a" AND size < 301