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: Muriel and her sister always took the shortcut home. Sentence2: One day they decided to take the long way home. Sentence3: A strange man followed them and they got scared. Sentence4: They started running and screaming until they made it home. Sentence5: They told their parents and now they pick them up.

Ex Output:
Strange man, Muriel's parents, Muriel's sister, Muriel

Ex Input:
Sentence1: Phil wanted to have a fun evening out in town. Sentence2: He invited his friend Rich to join him for some karaoke. Sentence3: They went to a karaoke bar and had a few drinks. Sentence4: Phil got up on stage and started singing. Sentence5: His singing was atrocious, but everyone joined in anyway.

Ex Output:
Phil, Everyone, Rich

Ex Input:
Sentence1: Caroline had a white cat. Sentence2: One day her cat went missing. Sentence3: Caroline was very worried. Sentence4: She made flyers. Sentence5: Finally her neighbor found the cat.

Ex Output:
White cat, Caroline, Her neighbor