Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_39 (grid INTEGER, driver VARCHAR)
### Question:
Which Grid did Alain Prost drive on?
### Answer:
SELECT SUM(grid) FROM table_name_39 WHERE driver = "alain prost"