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: tabouleh ( "tabūlah"; also tabbouleh or tab(b)ouli) is a salad.

Output: tabouleh


Input: Consider Input: prince-electors were the group of rulers of german countries which elected the holy roman emperor.


Output: prince-elector