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_19266557_1 (original_air_date VARCHAR, _number VARCHAR)
### Question:
For episode number 7, what was the numbers of original air dates?
### Answer:
SELECT COUNT(original_air_date) FROM table_19266557_1 WHERE _number = 7