What are the keywords in the following sentence? a puppy of labrador retriever in a grass
grass, puppy, retriever

What are the keywords in the following sentence? a poster for political party from the election it reads
election, party, poster

What are the keywords in the following sentence? silhouette of electricity pylons on the wheat field from beautiful sunset till nightly starry sky .
field, pylon, silhouette, sunset

What are the keywords in the following sentence? a pizza that is covered in cheese and meats
cheese, cover, meat, pizza