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_name_18 (season INTEGER, level VARCHAR, position VARCHAR)
### Question:
Which Season has a Level of tier 4, and a Position of 11th?
### Answer:
SELECT SUM(season) FROM table_name_18 WHERE level = "tier 4" AND position = "11th"