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.

Input: Consider Input: Sentence1: Alex owned a lot of money to a loan shark. Sentence2: He was desperate to make money as fast as he could to repay the loan. Sentence3: He went to the casino and gambled everything he had left. Sentence4: In a lucky strike, he quadrupled his earnings. Sentence5: He then paid the loan shark and swore to never borrow money again.

Output: Alex

Input: Consider Input: Sentence1: Bob love to eat steak. Sentence2: He wants to get steak for an upcoming barbeque. Sentence3: He went to the store but he couldn't find any steak. Sentence4: He continued searching but he still didn't find any steak. Sentence5: His son brought enough steak for everyone for the barbeque.

Output: Bob

Input: Consider Input: Sentence1: The woman didn't buy food for her children. Sentence2: They were always hungry. Sentence3: One day the youngest child went next door. Sentence4: He asked the neighbors for some food. Sentence5: They all came over and had a feast.
Output: Neighbors, The woman, Youngest child, Children