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_21564794_3 (championships_in_st_louis VARCHAR, sport VARCHAR)
### Question:
How many championships were won for arena football?
### Answer:
SELECT championships_in_st_louis FROM table_21564794_3 WHERE sport = "Arena Football"