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 (primary_conference VARCHAR, ihsaa_football_class VARCHAR, school VARCHAR)
### Question:
What is the primary conference with a IHSAA Football Class of A, at South Decatur school?
### Answer:
SELECT primary_conference FROM table_name_56 WHERE ihsaa_football_class = "a" AND school = "south decatur"