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_25517718_3 (extra_points INTEGER, position VARCHAR)
### Question:
What is the smallest number of extra points for a left halfback?
### Answer:
SELECT MIN(extra_points) FROM table_25517718_3 WHERE position = "Left halfback"