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 (laps INTEGER, time VARCHAR, grid VARCHAR)
### Question:
What is the lowest number of Laps that have a Time of +24.440, and a Grid higher than 18?
### Answer:
SELECT MIN(laps) FROM table_name_39 WHERE time = "+24.440" AND grid > 18