TASK DEFINITION: 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.
PROBLEM: grand-corent is a commune.

SOLUTION: grand-corent

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

SOLUTION: e-book

PROBLEM: british rail class ee1 was an electric locomotive commissioned by the north eastern railway in 1922.

SOLUTION:
british rail class ee1