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_63230 ( "School" text, "Location" text, "Mascot" text, "County" real, "Enrollment" text, "IHSAA Class" text, "Year Joined" real, "Previous Conference" text )

### Question ###
Which school has an enrollment of A and had lost river as their previous conference?

### Accurate SQL ###

SELECT "School" FROM table_63230 WHERE "Previous Conference" = 'lost river' AND "Enrollment" = 'a'