Attendance larger than 63,439, and an Opponent of bayer leverkusen had what result?
CREATE TABLE "group_stage" (
  "date" text,
  "opponents" text,
  "result_f_a" text,
  "attendance" real,
  "group_position" text
);
SELECT "result_f_a" FROM "group_stage" WHERE "attendance">'63,439' AND "opponents"='bayer leverkusen';