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: Fred was going to make sure he didn't end up like his dad. Sentence2: His dad abused his mom and never provided for his family. Sentence3: Fred found a good job and got married. Sentence4: He supported his family and never abused them. Sentence5: Fred was proud of his own accomplishments.

Ex Output:
His mom, His dad, His family, Fred

Ex 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.

Ex Output:
I (myself), Old man

Ex Input:
Sentence1: Tim is a toddler. Sentence2: His parents wanted him to go to preschool. Sentence3: But he was only 3 years old. Sentence4: The teachers talked to him. Sentence5: They thought he was not ready due to his age.

Ex Output:
Tim, Parents, Teachers