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.

Ex Input:
the australian music prize (the amp) is a yearly award for an australian band or solo artist.

Ex Output:
australian music prize


Ex Input:
"polythene pam" is a song written by john lennon, credited to lennon/mccartney, and performed by the beatles on their album "abbey road".

Ex Output:
polythene pam


Ex Input:
the cyclostomes (or cyclostomata) are the lamprey and hagfish.

Ex Output:

cyclostome