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: Tom was a janitor at school. Sentence2: The kids would frequently chat with him. Sentence3: Tom offered them advice. Sentence4: The kids listened to his advice. Sentence5: The kids improved their lives by listening to his wise advice.
Output:
Kids, Tom