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_27 (goal_difference INTEGER, goals_against VARCHAR, draws VARCHAR)
### Question:
What is the goal difference sum that has goals against smaller than 33, draws larger than 13?
### Answer:
SELECT SUM(goal_difference) FROM table_name_27 WHERE goals_against < 33 AND draws > 13