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.

Example Input: institut d'optique graduate school (supoptique) is a renowned graduate engineering school in france.
Example Output: institut d'optique graduate school

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

Example Input: cornish people (cornish: kernowyon) are often regarded as a distinct ethnic group or national identity of the united kingdom, originating in cornwall.
Example Output:
cornish people