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: 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.
Example Output: Carl

Example Input: Sentence1: Gina had inherited a house from her parents. Sentence2: She wanted to sell the house. Sentence3: Gina took out the things that had sentimental value. Sentence4: She found a realtor to sell the house. Sentence5: Gina sold the house to a buyer.
Example Output: Realtor, Buyer, Gina, Parents

Example Input: Sentence1: Griffin needed to write a book report for school. Sentence2: He went to the library to find a book. Sentence3: He found an interesting book about Abraham Lincoln. Sentence4: Griffin started to read the book, but fell asleep. Sentence5: When he woke, Griffin decided to pick a different topic.
Example Output:
Griffin, Abraham lincoln