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: Joshua moved to a new neighborhood. Sentence2: He had a lot of fun neighbors. Sentence3: He stood outside and drank a beer and talked to them. Sentence4: Then he drank a few more and talked longer. Sentence5: Soon he was out of beer and ready to go inside.
Example Output: Joshua, Neighbors

Example Input: Sentence1: Tommy wanted to fix the scratches on his car. Sentence2: The scratches came from a curb he missed last week. Sentence3: He bought some car paint from his local auto store. Sentence4: He spent a weekend covering the scratches on his car. Sentence5: Tommy's car looks brand new now.
Example Output: Tommy

Example Input: Sentence1: Josh was the best speller in his class. Sentence2: He could spell any word. Sentence3: His school was having a spelling bee. Sentence4: He was invited to compete. Sentence5: When it was his turn, he won!
Example Output:
School, Josh