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: Jon was ten years old when his parents showed him a special movie. Sentence2: The movie was called The Elephant Man. Sentence3: Jon felt such compassion for the character in the film! Sentence4: Jon swore to himself that he would never say a cruel word to anyone. Sentence5: Jon is now fifty, and he has kept the promise he made to himself.
Example Output: Parents, Jon

Example Input: Sentence1: Darrel was sleeping peacefully. Sentence2: He had worked for 12 hours and was exhausted! Sentence3: He felt something wet and sticky on his face. Sentence4: His dog had missed him while he was at work. Sentence5: The dog wouldn't stop giving him kisses!
Example Output: Darrel, Dog

Example Input: Sentence1: Karen liked a diner in her town. Sentence2: She loved their burgers. Sentence3: The diner changed their recipe for the burgers. Sentence4: Karen didn't like the new recipe. Sentence5: She stopped going to the diner.
Example Output:
Karen