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 Jerry was going to fix Chesters bike. Sentence2: He told Chester he'll deliver it to him. Sentence3: Chester got a call from Mr Jerry. Sentence4: Apparently, Mr Jerry messed it up even worse. Sentence5: Mr Jerry promised to buy him a new bike though.
Output:
Mr jerry, Chester