CREATE TABLE table_name_99 (laps INT, driver VARCHAR, grid VARCHAR)

what is the least laps when the driver is rolf stommelen and the grid is more than 18?
SELECT MIN(laps) FROM table_name_99 WHERE driver = "rolf stommelen" AND grid > 18
SELECT MIN("laps") FROM "table_name_99" WHERE "driver" = "rolf stommelen" AND "grid" > 18