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.

Input: Consider Input: philippe, chevalier de lorraine

Output: chevalier de lorraine

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

Output: eugenio bersellini

Input: Consider Input: an electronic book (also called an e-book, ebook or digital book) is a book in digital form.
Output: e-book