Name the rank timeslot for 18-49 share being 13
CREATE TABLE table_2390 (
    "Episode" real,
    "First Air Date" text,
    "Rating (18\u201349)" text,
    "Share (18\u201349)" real,
    "Viewers (millions)" text,
    "Rank (timeslot)" text
)
SELECT COUNT("Rank (timeslot)") FROM table_2390 WHERE "Share (18\u201349)" = '13'
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 rank timeslot for 18-49 share being 13 ### Input: CREATE TABLE table_2390 (
    "Episode" real,
    "First Air Date" text,
    "Rating (18\u201349)" text,
    "Share (18\u201349)" real,
    "Viewers (millions)" text,
    "Rank (timeslot)" text
) ### Response: SELECT COUNT("Rank (timeslot)") FROM table_2390 WHERE "Share (18\u201349)" = '13'