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_52 (fa_trophy INTEGER, player VARCHAR, league VARCHAR)
### Question:
How many  FA Trophy has a Player of mario walsh and a League larger than 17?
### Answer:
SELECT AVG(fa_trophy) FROM table_name_52 WHERE player = "mario walsh" AND league > 17