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:
the thalamus is a symmetrical structure in the brains of vertebrates.

Ex Output:
thalamus


Ex Input:
waiting for guffman is a musical mockumentary movie made in 1997.

Ex Output:
waiting for guffman


Ex Input:
the centre for conflict and peace studies (abbreviated caps) is an independent research organization, which started in july 2006.

Ex Output:

centre for conflict and peace studies