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 moirai(the fates) were the three goddesses of destiny in greek mythology.
Example Output: moirai

Example Input: fair use is the idea that it should be okay for a person to reuse something that another person has created, in certain amounts and for certain purposes, without breaking the law.
Example Output: fair use

Example Input: tatsuya kamohara (born 8 july 1983) is a japanese football player.
Example Output:
tatsuya kamohara