Name the sum of Long for yards less than 197 and players of matt nagy
CREATE TABLE "running_backs" (
  "player" text,
  "car" real,
  "yards" real,
  "avg" real,
  "td_s" real,
  "long" real
);
SELECT SUM("long") FROM "running_backs" WHERE "yards"<197 AND "player"='matt nagy';