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: Maria was very sad. Sentence2: She used Kleenex to dab at her tears. Sentence3: When she'd used the whole box, she got another out of the cabinet. Sentence4: She blew her nose a few times when she was done crying. Sentence5: The Kleenex were all soaked.

Ex Output:
Maria

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: The dog has been itching and scratching a lot lately. Sentence2: I took a look at her belly while we were playing this afternoon. Sentence3: I noticed several red marks and sores on her belly. Sentence4: Apparently fall is a rough time with dogs and allergies. Sentence5: I made an appointment with the vet for a bath and exam this Friday.

Ex Output:
I (myself), Vet, Dog