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 division of hughes is an australian electoral division in new south wales.
Example Output: division of hughes

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

Example Input: peter naur (25 october 1928 – 3 january 2016) was a danish computer science pioneer and turing award winner.
Example Output:
peter naur