What was the 1987 result for the tournament with 1986 result of 3R and 1989 of A?
CREATE TABLE "grand_prix_singles_tournament_timeline" (
  "tournament" text,
  "1983" text,
  "1984" text,
  "1985" text,
  "1986" text,
  "1987" text,
  "1988" text,
  "1989" text,
  "1990" text,
  "career_sr" text
);
SELECT "1987" FROM "grand_prix_singles_tournament_timeline" WHERE "1989"='a' AND "1986"='3r';