CREATE TABLE table_51906 ("Player" TEXT, "Car." FLOAT, "Yards" FLOAT, "Avg." FLOAT, "TD's" FLOAT, "Long" FLOAT)

Name the sum of Long for yards less than 197 and players of matt nagy
SELECT SUM("Long") FROM table_51906 WHERE "Yards" < '197' AND "Player" = 'matt nagy'
SELECT SUM("Long") FROM "table_51906" WHERE "Player" = 'matt nagy' AND "Yards" < '197'