Which Length has a Country of soviet union, and a Year larger than 1975?
CREATE TABLE "films_directed_by_tarkovsky" (
  "year" real,
  "english_title" text,
  "original_title" text,
  "country" text,
  "length" text
);
SELECT "length" FROM "films_directed_by_tarkovsky" WHERE "country"='soviet union' AND "year">1975;