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.

Ex Input:
Sentence1: Quentin had always wanted to learn to play football. Sentence2: One day he decided to try out for the school team. Sentence3: He was luckily given a spot on the team. Sentence4: Quentin worked hard until he was a football expert. Sentence5: He was glad he had learned to play football.

Ex Output:
Quentin, Team

Ex 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.

Ex Output:
Will, Dad, School, Teachers

Ex Input:
Sentence1: Nessa was playing at the creek. Sentence2: It was a hot day, so she decided to swim. Sentence3: She jumped in and refreshed herself. Sentence4: But when she climbed out, there was a leech stuck on her leg! Sentence5: Nessa was completely disgusted!

Ex Output:
Herself, Leech, Nessa