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: theoxena scissaria is a species of moth.
Example Output: theoxena scissaria

Example Input: accountancy or accounting is the job of sharing financial information about a business to managers and shareholders (people who have invested in the business).
Example Output: accountancy

Example Input: professor emil hamilton or ruina is a fictional superman character.
Example Output:
emil hamilton