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_70 (grid INTEGER, time_retired VARCHAR, qual VARCHAR)
### Question:
What is the smallest grid with a Time/Retired of engine, and a qual of less than 138.75?
### Answer:
SELECT MIN(grid) FROM table_name_70 WHERE time_retired = "engine" AND qual < 138.75