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: cumulative voting is a system for doing an election.

Output: cumulative voting


Input: Consider Input: laurie cunningham is a former football player.

Output: laurie cunningham


Input: Consider Input: a light year (symbol: ly) is the distance that light travels in empty space in one year.


Output: light year