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: Calvin was so excited! Sentence2: His friends were coming over for a birthday party. Sentence3: He cleaned his room and decorated the play room. Sentence4: They came over and brought him gifts. Sentence5: He had a great time!

Output: Friends, Calvin

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: We had ham steaks for dinner tonight. Sentence2: My wife fried up two ham steaks. Sentence3: She defrosted some frozen veggies and heated up leftover potatoes. Sentence4: I used to cook but am disabled due to a stroke. Sentence5: With the simpler dinners I have lost thirty pounds.
Output: I (myself), Wife