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:
arabesque is an artistic decoration.

Ex Output:
arabesque


Ex Input:
institut d'optique graduate school (supoptique) is a renowned graduate engineering school in france.

Ex Output:
institut d'optique graduate school


Ex Input:
county monaghan (in gaelic ) is a county in ireland.

Ex Output:

county monaghan