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.

Input: Consider Input: regent's canal is a canal in england.

Output: regent's canal


Input: Consider Input: a dipole speaker is a type of a loudspeaker.

Output: dipole speaker


Input: Consider Input: mae west (august 17, 1893 – november 22, 1980) was an american actress and movie star.


Output: mae west