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: John did not know how to roller skate. Sentence2: His friend said that he would teach him. Sentence3: They spent all day practicing skating. Sentence4: John kept trying and got very good. Sentence5: Now he roller skates all over the neighborhood.
Example Output: John, Friend

Example Input: Sentence1: Merdis didn't want to waste her vote on someone she didn't like. Sentence2: She went to the library to research other options. Sentence3: The librarian directed Merdis to the city's Election Board. Sentence4: They explained in detail to Merdis what her options were. Sentence5: Merdis decided to vote herself in as a candidate in the upcoming race.
Example Output: Librarian, Merdis

Example Input: Sentence1: I wanted to date a girl. Sentence2: But, I was too shy to ask anyone out. Sentence3: I decided to get help from my brother. Sentence4: He taught me how to get girls to like me. Sentence5: But, it was pointless because years later I realized that I liked men.
Example Output:
I (myself), Girl, Brother