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: Jim liked to watch sports, but never played. Sentence2: He mostly wished he was better at basketball. Sentence3: Jim's friends eventually encouraged him to join the basketball team. Sentence4: After lots of practice, Jim's skills increased. Sentence5: Now Jim is the best player on the team, and he feels accomplished.
Example Output: Jim, Jim's friends

Example Input: Sentence1: Katy loved to cook. Sentence2: She just finished dinner one night and decided to make a dessert. Sentence3: She picked out a recipe, but did not have all the ingredients. Sentence4: She made some substitutions that she thought would work. Sentence5: When she removed the dessert from the oven, it was not edible.
Example Output: Katy

Example Input: Sentence1: Sam was taking a hike by the lake. Sentence2: He got too close and slipped. Sentence3: Sam fell into the water. Sentence4: He dragged himself out but was soaked. Sentence5: Sam had to go home to change.
Example Output:
Sam