Tell me the captain for guns of 28
CREATE TABLE "ships_served_in_by_richard_bolitho" (
  "ship" text,
  "guns" text,
  "class" text,
  "captain" text,
  "rank" text,
  "year" text
);
SELECT "captain" FROM "ships_served_in_by_richard_bolitho" WHERE "guns"='28';