For episode number 7, what was the numbers of original air dates?
CREATE TABLE table_19266557_1 (
    original_air_date VARCHAR,
    _number VARCHAR
)
SELECT COUNT(original_air_date) FROM table_19266557_1 WHERE _number = 7
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: For episode number 7, what was the numbers of original air dates? ### Input: CREATE TABLE table_19266557_1 (
    original_air_date VARCHAR,
    _number VARCHAR
) ### Response: SELECT COUNT(original_air_date) FROM table_19266557_1 WHERE _number = 7