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:
pipo de clown (english: pipo the clown) is a clown who became very popular on dutch television.

Ex Output:
pipo de clown


Ex Input:
chumbawamba were a british alternative rock group.

Ex Output:
chumbawamba


Ex Input:
the julian day or julian day number (jdn) is the number of days that have passed since the initial epoch defined as noon universal time (ut) monday, 1 january 4713 bc in the julian calendar.

Ex Output:

julian day