CREATE TABLE table_name_63 (position INT, club VARCHAR, goal_difference VARCHAR)

What is the position of club Melilla CF, with a goal difference smaller than -10?
SELECT SUM(position) FROM table_name_63 WHERE club = "melilla cf" AND goal_difference < -10
SELECT SUM("position") FROM "table_name_63" WHERE "club" = "melilla cf" AND "goal_difference" < -10