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: She opened the back door and propped it. Sentence2: The dog didn't notice. Sentence3: A loud noise got her attention. Sentence4: It was a bird in the backyard. Sentence5: She ran outside to check it out.
Example Output: Dog, Bird

Example Input: Sentence1: Anna was jogging with her phone in her pocket. Sentence2: Suddenly she heard a noise and looked down. Sentence3: Her phone had fallen out of her pocket! Sentence4: Scared, she bent down to pick it up. Sentence5: She was so relieved to see it wasn't cracked!
Example Output: Anna

Example Input: Sentence1: Ken hated going to church with his family. Sentence2: He thought it was boring and pointless. Sentence3: One Sunday he was finally allowed to stay home. Sentence4: Ken had a lot of fun watching tv and playing video games. Sentence5: He started skipping church a lot more.
Example Output:
Ken, His family