Definition: In this task, you're given a story (which contains five sentences only). Your task is to find all the characters which are available in the given story.
Input: Sentence1: Mr Quan was a famous professor. Sentence2: His fame was taking off thanks to his research. Sentence3: He made strides in the field of medicine. Sentence4: He is teaching others in field. Sentence5: With his knowledge he changed lives.
Output:
Others, Mr quan