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_1888157_1 (ga INTEGER, gf VARCHAR)
### Question:
What is the highest GA when GF is 39?
### Answer:
SELECT MAX(ga) FROM table_1888157_1 WHERE gf = 39