How many heights are listed for Jesse Holley in the WR position? 
CREATE TABLE "contestants" (
  "position" text,
  "name" text,
  "jersey_number" real,
  "age" real,
  "height" text,
  "weight" real,
  "college" text,
  "result" text
);
SELECT COUNT("height") FROM "contestants" WHERE "position"='WR' AND "name"='Jesse Holley';