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: Lily was tired of her parents trying to pull out her loose tooth. Sentence2: But it wouldn't come out! Sentence3: Her brother suggested she chew bubble gum. Sentence4: Almost as soon as she started she felt a little tug. Sentence5: Her tooth had finally come out.
Output:
Parents, Lily, Brother