What is channel 33.7's official call sign?
CREATE TABLE table_1404984_1 (call_sign VARCHAR, virtual_channel VARCHAR)
SELECT call_sign FROM table_1404984_1 WHERE virtual_channel = "33.7"
### 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"