Instructions: 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: Chris wanted to take up a new hobby. Sentence2: He knew he wanted something relaxing. Sentence3: He asked his friends for advice. Sentence4: His friends suggested fishing. Sentence5: Chris began fishing and enjoyed it.
Output:
Chris, Friends