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

Output: web hosting service


Input: Consider Input: police action is a term for the use of military forces without declaring war.

Output: police action


Input: Consider Input: christian vieri (born 12 july, 1973) is a former italian football player.


Output: christian vieri