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: alphonse laveran (charles louis alphonse laveran, 18 june 1845 – 18 may 1922) was a french military doctor.
Example Output: alphonse laveran

Example Input: curro torres (born 27 december 1976) is a spanish football player.
Example Output: curro torres

Example Input: an aloha shirt (also known as a hawaiian shirt) is a type of shirt that comes from hawaii.
Example Output:
aloha shirt