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:
metal gear is an action-adventure stealth video game franchise made by konami.

Ex Output:
metal gear


Ex Input:
a web hosting service is a type of internet hosting service.

Ex Output:
web hosting service


Ex Input:
migennes is a commune.

Ex Output:

migennes