What is the identifying number for a description of Stanier (Period III) full brake?
CREATE TABLE "lms_coaches" (
  "number_name" text,
  "description" text,
  "current_status" text,
  "livery" text,
  "date" real
);
SELECT "number_name" FROM "lms_coaches" WHERE "description"='stanier (period iii) full brake';