How many writers were for season #1?
CREATE TABLE "season_4_1958_59" (
  "series_num" real,
  "season_num" real,
  "title" text,
  "director" text,
  "writer_s" text,
  "airdate" text
);
SELECT COUNT("writer_s") FROM "season_4_1958_59" WHERE "season_num"=1;