CREATE TABLE table_46602 ("Tournament" TEXT, "1983" TEXT, "1984" TEXT, "1985" TEXT, "1986" TEXT, "1987" TEXT, "1988" TEXT, "1989" TEXT, "1990" TEXT, "Career SR" TEXT)

What is the 1989 result for the tournament that had a 1983 and 1987 result of A?
SELECT "1989" FROM table_46602 WHERE "1983" = 'a' AND "1987" = 'a'
SELECT "1989" FROM "table_46602" WHERE "1983" = 'a' AND "1987" = 'a'