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: When the little boy went home, he couldn't find his mother or father. Sentence2: He looked all around. Sentence3: He called their names but no one answered. Sentence4: Eventually a neighbor heard him. Sentence5: She said his parents were at her home.
Example Output: Mother, Father, Neighbor, The little boy

Example Input: Sentence1: Riley had always enjoyed playing board games. Sentence2: One day he decides to play chess with a friend. Sentence3: It was a difficult game. Sentence4: In the end, Riley lost the chess game. Sentence5: However, he still loved board games.
Example Output: A friend, Riley

Example Input: Sentence1: Ryan's neighbor had two white poodles. Sentence2: One day he walked by the yard and they were bright pink. Sentence3: He went to the door to ask Miss Lindt what happened. Sentence4: She said they had been to the groomers that day. Sentence5: Some pink dye fell into the bathwater, dying their fur!
Example Output:
Ryan's neighbor, Two white poodles