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: Rick was at a restaurant. Sentence2: And he was curious about how all of the different items tasted. Sentence3: So he ordered way more than he could eat. Sentence4: And he forced himself to finish everything out of guilt. Sentence5: Rick tried to quell his curiosity the next time.

Ex Output:
Rick

Ex Input:
Sentence1: When Poppy was growing up, she had a very special doll. Sentence2: She took the doll with her everywhere. Sentence3: As she got older, her mother tried to make her give up the doll. Sentence4: Poppy hid the doll so her mother couldn't find it. Sentence5: But Poppy's dog found the doll and chewed it to pieces.

Ex Output:
Poppy, Dog, Mother

Ex Input:
Sentence1: Hal stayed with his mom for awhile after his dad had passed away. Sentence2: He knew that she was not in a good place. Sentence3: She often cried and was so alone and despondent. Sentence4: Hal decided to have his mom move in with her. Sentence5: His mom passed away within the year.

Ex Output:
Mom, Hal's dad, Hal