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: Marie had decided to organize a barbecue. Sentence2: Four cars of friends and family went to the state park. Sentence3: After getting lost and car trouble it was late when they arrived. Sentence4: The food just finished burning as the park was closing. Sentence5: As they ate and ran to the cars a raccoon chased after them.

Ex Output:
Raccoon, Marie, Friends, Family

Ex Input:
Sentence1: Waiting for the next train to pull up, Harry was nervous. Sentence2: He was only a few hours away from his big interview. Sentence3: Spending the last three months sending out resumes, this was it. Sentence4: Boarding the train, he noticed something strange about the inside. Sentence5: He had hopped on the wrong color train, and would be late.

Ex Output:
Harry

Ex Input:
Sentence1: Bernie was excited. Sentence2: The circus was in town. Sentence3: He had finally convinced his mom to take him. Sentence4: They arrived at the big top and sat down. Sentence5: Bernie had a wonderful time at the circus with his mom.

Ex Output:
Mom, Bernie