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.

Ex 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.

Ex Output:
Librarian, Merdis

Ex Input:
Sentence1: Carl needed to lose weight. Sentence2: He found it very hard since he loved candy. Sentence3: He decided he would stop having candy in the house. Sentence4: He found it much easier to lose weight this way. Sentence5: Soon, Carl was down ten pounds and didn't miss eating candy at all.

Ex Output:
Carl

Ex Input:
Sentence1: Sean woke up one morning comfy in bed. Sentence2: Suddenly he realized that he was almost late for work. Sentence3: He got out of bed thinking it was already hopeless. Sentence4: Still he speed around getting ready quickly. Sentence5: Luckily he made it in time.

Ex Output:
Sean