What is the call sign for channel 6?
CREATE TABLE table_2638104_1 (
    callsign VARCHAR,
    channel VARCHAR
)
SELECT callsign FROM table_2638104_1 WHERE channel = 6
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the call sign for channel 6? ### Input: CREATE TABLE table_2638104_1 (
    callsign VARCHAR,
    channel VARCHAR
) ### Response: SELECT callsign FROM table_2638104_1 WHERE channel = 6