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 classroom (building VARCHAR, capacity VARCHAR)

### Question ###
How many rooms whose capacity is less than 50 does the Lamberton building have?

### Accurate SQL ###

SELECT COUNT(*) FROM classroom WHERE building = 'Lamberton' AND capacity < 50