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: jujutsu (柔術, jūjutsu) is an ancient japanese martial art.
Example Output: jujutsu

Example Input: love's labour's lost is a comedy play by william shakespeare which was written between 1588 and 1597.
Example Output: love's labour's lost

Example Input: the isles of scilly form an archipelago off the southwestern tip of the cornish peninsula of great britain.
Example Output:
isles of scilly