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: Maddie really wanted a puppy. Sentence2: Her mom told her if she gets all good grades, she could get one. Sentence3: She worked really hard for three months on her school work. Sentence4: When report cards came out, she had earned all a's and b's! Sentence5: Maddie's mom took her to get her puppy as her reward.

Ex Output:
Maddie, A puppy, Her mom

Ex Input:
Sentence1: Dennis decides he wants more hours at work. Sentence2: He decides he doesn't want to ask his boss for more hours. Sentence3: So, instead he just dawdles at night before he clocks out. Sentence4: But his boss is taking notice and tells him to stop. Sentence5: Dennis decides to ask his boss for more hours.

Ex Output:
Dennis, Boss

Ex Input:
Sentence1: The weather turned cold and foul by Jim's house. Sentence2: There was icy rain and the wind blew hard. Sentence3: Jim saw that his front steps were covered in ice. Sentence4: He took some salt from his garage and spread it on the steps. Sentence5: The ice melted a little so Jim added even more salt.

Ex Output:
Jim