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.

Example Input: Sentence1: Will was moved up a grade because he was so smart. Sentence2: The teachers warned his dad that he wouldn't grow emotionally. Sentence3: His dad insisted on moving him up a grade. Sentence4: Will was hated throughout school. Sentence5: He is now a very confused and disliked adult.
Example Output: Will, Dad, School, Teachers

Example Input: Sentence1: Eric has high functioning autism. Sentence2: For the most part he can function normally. Sentence3: But sometimes he gets very angry. Sentence4: Autistic people handle anger in a different way than most people. Sentence5: The rage is a lot more intense and scary.
Example Output: Autistic people, Most people, Eric

Example Input: Sentence1: Yui wanted to join a school club. Sentence2: She couldn't decide which club to join. Sentence3: Her friend told her that the music club was fun. Sentence4: Yui decided to join them because she could play guitar. Sentence5: The club had a spot open and they happily made her a member.
Example Output:
Yui, Music club, Friend