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:
bici bici or bicibici muhallebisi is a turkish dessert.

Ex Output:
bici bici


Ex Input:
san diego creek is a small northwest-flowing river in orange county, california.

Ex Output:
san diego creek


Ex Input:
an adventure is something exciting that happens to someone.

Ex Output:

adventure