How many people were watching when Livingston was the runner-up?
CREATE TABLE "scottish_football_league_challenge_cup_f" (
  "season" text,
  "winner" text,
  "score" text,
  "runner_up" text,
  "venue" text,
  "attendance" text
);
SELECT "attendance" FROM "scottish_football_league_challenge_cup_f" WHERE "runner_up"='livingston';