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: douglas lawrence "doug" osowski (born january 1, 1969) mostly known as mr. lawrence or doug lawrence is an american voice, actor, comedian, writer, storyboard artist, animator, and director.
Example Output: mr. lawrence

Example Input: san diego creek is a small northwest-flowing river in orange county, california.
Example Output: san diego creek

Example Input: len brown (born (1956--)1 1956) is the current mayor of auckland in new zealand and a lawyer.
Example Output:
len brown