Who wrote episode number 18?
CREATE TABLE table_28196105_1 (
    written_by VARCHAR,
    _number VARCHAR
)
SELECT written_by FROM table_28196105_1 WHERE _number = 18
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: Who wrote episode number 18? ### Input: CREATE TABLE table_28196105_1 (
    written_by VARCHAR,
    _number VARCHAR
) ### Response: SELECT written_by FROM table_28196105_1 WHERE _number = 18