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.

Example Input: the melbourne storm are an australian professional rugby league team.
Example Output: melbourne storm

Example Input: ans is a municipality in the belgian province of liège.
Example Output: ans

Example Input: in computer networking, mainly internet relay chat (irc), netsplit is the event when two servers disconnect.
Example Output:
netsplit