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.

Input: Consider Input: Sentence1: Jacob noticed his dog was whining. Sentence2: Jacob investigated and found his dog's leg hurt. Sentence3: He took the dog to see the vet. Sentence4: The vet made a cast to set the hurt leg. Sentence5: Within a few weeks, Jacob and his dog were playing again!

Output: Jacob, Vet, Dog

Input: Consider Input: Sentence1: Clayton was deathly afraid of house centipedes. Sentence2: One day he saw one scuttling around on his floor. Sentence3: Terrified, he called over his roommate to kill it for him. Sentence4: She walked in, unafraid, and swiftly smashed the bug with a book. Sentence5: Clayton was grateful and actually kind of impressed.

Output: Clayton, Roommate

Input: Consider Input: Sentence1: Angel forgot to set her alarm. Sentence2: She woke up when the light came in through the window. Sentence3: Angel looked at the clock and saw she was late for work. Sentence4: She called her boss and told him she overslept. Sentence5: The boss laughed and told her to take her time coming in.
Output: Angel, Her boss