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: Tre's bicycle really needed new brakes. Sentence2: Tre saved up all his allowance to take his bike to the shop. Sentence3: On the way a teenager jumped Tre and stole all his money and his bike. Sentence4: Tre walked home crying and empty handed. Sentence5: When he got there he found his mother dead.

Ex Output:
A teenager, His mother, Tre

Ex Input:
Sentence1: Leeroy stole Maddie's pencil when she wasn't looking. Sentence2: When Maddie returned, he told her he didn't know where it was. Sentence3: Maddie looked around everywhere for it. Sentence4: Leeroy felt terrible for denying having taken it. Sentence5: When Maddie wasn't looking, Leeroy put it back.

Ex Output:
Leeroy, Maddie

Ex Input:
Sentence1: We went to Saint Thomas for our honeymoon. Sentence2: We paid a lot for a luxurious hotel. Sentence3: Our hotel room was infested with large, Caribbean rats. Sentence4: We had to complain multiple times to incompetent hotel management. Sentence5: We finally received a refund.

Ex Output:
Caribbean rats