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: John was evicted from his apartment for excessive noise. Sentence2: A co-worker offered a couch to John while he looked for a new place. Sentence3: John was grateful. Sentence4: John slept on the co-worker's couch that night. Sentence5: John awoke to a note saying the coworker was being evicted!
Output:
John, Co-worker