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_15187735_8 (series_ep VARCHAR, segment_a VARCHAR)
### Question:
Name the number of series episode for s piston
### Answer:
SELECT COUNT(series_ep) FROM table_15187735_8 WHERE segment_a = "s Piston"