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 (tie_no VARCHAR, away_team VARCHAR)
### Question:
What is the Tie no of the Port Vale Away game?
### Answer:
SELECT tie_no FROM table_name_56 WHERE away_team = "port vale"