Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

Ex Input:
margaret colin (born may 26, 1958) is an american actress.

Ex Output:
margaret colin


Ex Input:
eric saade (born 29 october 1990 in helsingborg, sweden) is a swedish singer.

Ex Output:
eric saade


Ex Input:
san diego creek is a small northwest-flowing river in orange county, california.

Ex Output:

san diego creek