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_56 (surface VARCHAR, outcome VARCHAR, championship VARCHAR)
### Question:
What is the listed surface for the Championship of Toronto that had a runner-up outcome?
### Answer:
SELECT surface FROM table_name_56 WHERE outcome = "runner-up" AND championship = "toronto"