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:
a nature reserve (preserve or (national/nature) conserve) is a protected area.

Ex Output:
nature reserve


Ex Input:
panampatta is a village situated near pathanapuram in kollam district, kerala state, india.

Ex Output:
panampatta


Ex Input:
a mixed government or mixed constitution is a form of government where different sized groups of people control different types of issues.

Ex Output:

mixed government