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: chen zhongshi (; august 1942 – 29 april 2016) was a chinese author.
Example Output: chen zhongshi

Example Input: the british rail class 931 was reserved for former southern region electrical multiple units converted for departmental use.
Example Output: british rail class 931

Example Input: simcoe composite school is a high school in simcoe, ontario, canada.
Example Output:
simcoe composite school