Name the number of episodes for alan nourse
CREATE TABLE table_15739098_1 (
    episode VARCHAR,
    story VARCHAR
)
SELECT COUNT(episode) FROM table_15739098_1 WHERE story = "Alan Nourse"
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: Name the number of episodes for alan nourse ### Input: CREATE TABLE table_15739098_1 (
    episode VARCHAR,
    story VARCHAR
) ### Response: SELECT COUNT(episode) FROM table_15739098_1 WHERE story = "Alan Nourse"