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_20669355_2 ( height__ft_ VARCHAR, hometown VARCHAR )

### Question ###
How many different heights are there for the contestants from Warsaw?

### Accurate SQL ###

SELECT COUNT(height__ft_) FROM table_20669355_2 WHERE hometown = "Warsaw"