CREATE TABLE table_name_27 (goal_difference NUMBER, goals_against VARCHAR2, draws VARCHAR2)

What is the goal difference sum that has goals against smaller than 33, draws larger than 13?
SELECT SUM(goal_difference) FROM table_name_27 WHERE goals_against < 33 AND draws > 13
SELECT SUM("goal_difference") FROM "table_name_27" WHERE "draws" > 13 AND "goals_against" < 33