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_1404984_1 (call_sign VARCHAR, virtual_channel VARCHAR)
### Question:
What is channel 33.7's official call sign?
### Answer:
SELECT call_sign FROM table_1404984_1 WHERE virtual_channel = "33.7"