In which Place was the Silver won by valeri postoianov ( urs ) later than 1969 and the Bronze won by alexander gazov ( urs )?
CREATE TABLE "world_championships_men" (
  "year" real,
  "place" text,
  "gold" text,
  "silver" text,
  "bronze" text
);
SELECT "place" FROM "world_championships_men" WHERE "silver"='valeri postoianov ( urs )' AND "year">1969 AND "bronze"='alexander gazov ( urs )';