With a year larger than 1905, and a location of philadelphia, pennsylvania with a to par [a] of n/a and a country of scotland what is the course?
CREATE TABLE "u_s_open_champions" (
  "year" real,
  "country" text,
  "course" text,
  "location" text,
  "total_score" text,
  "to_par_a" text
);
SELECT "course" FROM "u_s_open_champions" WHERE "to_par_a"='n/a' AND "country"='scotland' AND "year">1905 AND "location"='philadelphia, pennsylvania';