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.

Example Input: Sentence1: Lisa had always wanted to try making jewelry. Sentence2: She started by creating some earrings. Sentence3: That inspired her to make even more. Sentence4: Lisa continued to make more earrings. Sentence5: She was happy that she was making jewelry.
Example Output: Lisa

Example Input: Sentence1: On a sidewalk i saw an old man carrying his heavy bag. Sentence2: I helped him carry his bag along to the bus where he rides. Sentence3: He bid thanks and he wants to give me money. Sentence4: I didn't accept it because i'm not expecting anything in return. Sentence5: Then he said he admires me of my good deeds.
Example Output: I (myself), Old man

Example Input: Sentence1: Reg was 4 years old when he started getting hives. Sentence2: His doctor told his parents he was allergic to cheese. Sentence3: Reg couldn't have ice cream, yogurt, or pizza. Sentence4: He sadly watched his family eat these things without him. Sentence5: His mom bought imitation ice cream and pizza, but it wasn't the same.
Example Output:
Mom, Parents, Reg, Family, Doctor