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: Alfredo realizes that his stereo system at home is getting old. Sentence2: He decides to look for a replacement. Sentence3: Alfredo buys a great stereo system on sale at a local store. Sentence4: He sets it up at home and it sounds great! Sentence5: Alfredo feels happy now that he has a new stereo system at home.

Output: Alfredo

Input: Consider Input: Sentence1: Andrea was at the mall with her friends. Sentence2: She saw a soft hooded sweatshirt that she fell in love with. Sentence3: She didn't have much money and thought about stealing it. Sentence4: In the dressing room, she ripped off the tags. Sentence5: Then she tucked it away and hurried out of the mall.

Output: Andrea, Her friends

Input: Consider Input: Sentence1: Bill got a new job. Sentence2: He would be working at the grocery store. Sentence3: He liked to stock the shelves. Sentence4: He worked at the job for five weeks. Sentence5: He was really happy with his new work!
Output: Bill