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 temple of athena nike is a temple on the acropolis of athens.

Ex Output:
temple of athena nike


Ex Input:
the saint petersburg stadium (russian: Стадион Санкт-Петербург; also called the krestovsky stadium or zenit arena) is an association football stadium in saint petersburg, russia.

Ex Output:
saint petersburg stadium


Ex Input:
shinji ono (小野 伸二, ono shinji, born september 27, 1979) is a japanese football player.

Ex Output:

shinji ono