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:
yoshihiro uchimura (born 24 august 1984) is a japanese football player.

Ex Output:
yoshihiro uchimura

Ex Input:
the features of a production vehicle or production car are mass-produced identical models, offered for sale to the public.

Ex Output:
production vehicle

Ex Input:
a shinto shrine is a place where people worship in the shinto religion.

Ex Output:
shinto shrine