What were the highest goals against when the position was larger than 19 and the goals smaller than 36?
CREATE TABLE "relegation_playoff" (
  "position" real,
  "club" text,
  "played" real,
  "points" real,
  "wins" real,
  "draws" real,
  "losses" real,
  "goals_for" real,
  "goals_against" real,
  "goal_difference" real
);
SELECT MAX("goals_against") FROM "relegation_playoff" WHERE "position">19 AND "goals_for"<36;