How many winners have a runner-up of A. Karthikeyan?
CREATE TABLE table_22753439_1 (
    winner VARCHAR,
    runner_up_a VARCHAR
)
SELECT COUNT(winner) FROM table_22753439_1 WHERE runner_up_a = "A. Karthikeyan"
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: How many winners have a runner-up of A. Karthikeyan? ### Input: CREATE TABLE table_22753439_1 (
    winner VARCHAR,
    runner_up_a VARCHAR
) ### Response: SELECT COUNT(winner) FROM table_22753439_1 WHERE runner_up_a = "A. Karthikeyan"