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: Sam wanted to learn how to read. Sentence2: He thought his friends would mock his illiteracy. Sentence3: But when they found out, they were all very kind. Sentence4: They even volunteered to teach him his letters. Sentence5: After months of studying, Sam became a great reader!
Example Output: His friends, Sam

Example Input: Sentence1: Leanna was the smartest student in her class, nothing was hard. Sentence2: She grew to become a conceited person based on her academical prowess. Sentence3: She loved that many of her friends were jealous of the attention. Sentence4: One day her best friend caught her cheating and told everyone. Sentence5: Her reputation was forever ruined and she wasn't considered smart.
Example Output: Her best friend, Her friends, Leanna, Class

Example Input: Sentence1: My dad got a new job across the country. Sentence2: He told my brothers and I that we had to move. Sentence3: I was so sad I would never see my friends again. Sentence4: Luckily, I was able to find new friends pretty quickly! Sentence5: Moving across the country was not so bad after all!
Example Output:
My brothers, I (myself), My friends, New friends, Dad