TASK DEFINITION: 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.
PROBLEM: 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.

SOLUTION: I (myself), Old man

PROBLEM: Sentence1: Dirt Nasty was a rapper. Sentence2: He spun rhymes about his escapades. Sentence3: He was so good at it, they forgot there was a person behind the name. Sentence4: Thus Dirt fell into a depression. Sentence5: In his depression, he gave up rap, and took up advocacy work.

SOLUTION: Dirt nasty

PROBLEM: Sentence1: Anna was on a ship in the ocean. Sentence2: She was watching the waves eagerly. Sentence3: She hoped to see a mermaid! Sentence4: She tried to scan the entire ocean. Sentence5: But after weeks, she had not seen any mermaids.

SOLUTION:
Ship, Mermaid, Anna