How many directors worked on the episode written by Brent Fletcher & Miranda Kwok?
CREATE TABLE table_23918997_1 (
    directed_by VARCHAR,
    written_by VARCHAR
)
SELECT COUNT(directed_by) FROM table_23918997_1 WHERE written_by = "Brent Fletcher & Miranda Kwok"
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: How many directors worked on the episode written by Brent Fletcher & Miranda Kwok? ### Input: CREATE TABLE table_23918997_1 (
    directed_by VARCHAR,
    written_by VARCHAR
) ### Response: SELECT COUNT(directed_by) FROM table_23918997_1 WHERE written_by = "Brent Fletcher & Miranda Kwok"