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: Jeff forgot to pay his phone bill. Sentence2: An important client attempted to contact Jeff. Sentence3: The call went directly to voicemail. Sentence4: The client took his business elsewhere. Sentence5: Jeff lost a good deal because he didn't pay his bill.
Output:
Client, Jeff