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:
mohamed allalou (born september 28, 1973) is an algerian boxer.

Ex Output:
mohamed allalou


Ex Input:
orvon grover autry (september 29, 1907 – october 2, 1998), better known as gene autry was an american movie actor and a singer.

Ex Output:
gene autry


Ex Input:
hattingen an der ruhr is a city about 60.000 people in the state of north rhine-westphalia in germany.

Ex Output:

hattingen