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_32 (attendance INTEGER, opponent VARCHAR, week VARCHAR)
### Question:
What is the attendance for the game against the Kansas City Chiefs earlier than week 13?
### Answer:
SELECT AVG(attendance) FROM table_name_32 WHERE opponent = "kansas city chiefs" AND week < 13