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 long-beaked echidnas make up one of the two genera (genus zaglossus) of echidna.

Ex Output:
long-beaked echidna


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

Ex Output:
yoshihiro uchimura


Ex Input:
portman road is an association football stadium in ipswich, suffolk, england.

Ex Output:

portman road