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 long-beaked echidnas make up one of the two genera (genus zaglossus) of echidna.

Ex Output:
long-beaked echidna


Ex Input:
mylo xyloto is the fifth studio album by coldplay.

Ex Output:
mylo xyloto


Ex Input:
pierce the veil is an post hardcore group formed in san diego, california in 2007.

Ex Output:

pierce the veil