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: The kids were going out of the country for the first time. Sentence2: They applied for their passports. Sentence3: They were so excited when they arrived! Sentence4: THey couldn't wait to get their first stamp! Sentence5: The kids loved to travel.

Ex Output:
Kids

Ex Input:
Sentence1: Nicholas was assigned a term paper in his economics class. Sentence2: It was on a topic about which he knew very little. Sentence3: Nicholas spent several days doing in-depth research. Sentence4: He wrote a ten page paper. Sentence5: Nicholas learned about a lot about his new topic.

Ex Output:
Nicholas

Ex Input:
Sentence1: Regina did not like her name at all. Sentence2: Every time she heard someone say it she would nearly wince. Sentence3: She decided to have her name legally changed. Sentence4: She filled out all the forms and got her name changed. Sentence5: She was so happy to finally be named Berry-Smoke Winchester IV.

Ex Output:
Regina, Someone