Which school has an enrollment of A and had lost river as their previous conference?
CREATE TABLE table_63230 (
    "School" text,
    "Location" text,
    "Mascot" text,
    "County" real,
    "Enrollment" text,
    "IHSAA Class" text,
    "Year Joined" real,
    "Previous Conference" text
)
SELECT "School" FROM table_63230 WHERE "Previous Conference" = 'lost river' AND "Enrollment" = 'a'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Which school has an enrollment of A and had lost river as their previous conference? ### Input: CREATE TABLE table_63230 (
    "School" text,
    "Location" text,
    "Mascot" text,
    "County" real,
    "Enrollment" text,
    "IHSAA Class" text,
    "Year Joined" real,
    "Previous Conference" text
) ### Response: SELECT "School" FROM table_63230 WHERE "Previous Conference" = 'lost river' AND "Enrollment" = 'a'