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: heybeliada is an island in sea of marmara in turkey.
Example Output: heybeliada

Example Input: altoids are a brand of breath mints and candies that have been sold since the 1800s.
Example Output: altoids

Example Input: nicole evangeline lilly (born august 3, 1979) is a canadian actress.
Example Output:
evangeline lilly