Who wrote episode #1 in season 7?
CREATE TABLE "table1_10470082_8" (
  "no" real,
  "num" real,
  "title" text,
  "director" text,
  "writer" text,
  "us_air_date" text,
  "storyteller" text,
  "villains" text
);
SELECT COUNT("writer") FROM "table1_10470082_8" WHERE "num"=1;