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_18536769_1 (call_sign VARCHAR, format VARCHAR)
### Question:
When hot adult contemporary is the format what is the call sign?
### Answer:
SELECT call_sign FROM table_18536769_1 WHERE format = "hot adult contemporary"