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 7 july 2005 london bombings (also called 7/7) were suicide bomb attacks aimed at london's public transport system during the morning rush hour.

Ex Output:
7 july 2005 london bombings


Ex Input:
michigan avenue is a major north-south street in chicago.

Ex Output:
michigan avenue


Ex Input:
kiko (born 26 april 1972) is a former spanish football player.

Ex Output:

kiko