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: 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.

Output: Poppy, Dog, Mother

Input: Consider Input: Sentence1: Los Angeles has the worst parking ever. Sentence2: After driving around the same block five times I found a spot. Sentence3: I threw my car into park and hopped out. Sentence4: I came back in five minutes and already had a parking ticket. Sentence5: I didn't realize it was a park only on a Tuesday with a blue car zone.

Output: I (myself)

Input: Consider Input: Sentence1: Ingrid recently paid off all her credit cards. Sentence2: She was now debt free. Sentence3: One day at lunch, she went to a small local diner to eat. Sentence4: She ordered her meal and then left a huge tip for the waitress. Sentence5: Ingrid was so happy that she could now give to others.
Output: The waitress, Ingrid