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:
zirconium is a chemical elemental metal.

Ex Output:
zirconium


Ex Input:
eugenio bersellini (10 june 1936 – 17 september 2017) was an italian football player and manager.

Ex Output:
eugenio bersellini


Ex Input:
a religious order is a group of people who live in some way set apart from others, in accordance with their specific religious devotion.

Ex Output:

religious order