What is the lowest week number that there was a game on October 23, 1977 with less than 68,977 people attending?
CREATE TABLE "schedule" (
  "week" real,
  "date" text,
  "opponent" text,
  "result" text,
  "record" text,
  "game_site" text,
  "attendance" real
);
SELECT MIN("week") FROM "schedule" WHERE "attendance"<'68,977' AND "date"='october 23, 1977';