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_63 (laps INTEGER, time_retired VARCHAR, grid VARCHAR)
### Question:
What is the average lap total for grids under 19 and a Time/Retired of +4 laps?
### Answer:
SELECT AVG(laps) FROM table_name_63 WHERE time_retired = "+4 laps" AND grid < 19