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.

Input: Consider Input: Sentence1: Tom was walking around. Sentence2: He found a wallet on the ground. Sentence3: It was completely empty. Sentence4: Tom thought it was a nice looking wallet. Sentence5: He kept it for himself.

Output: Tom

Input: Consider Input: Sentence1: Jim wandered into someone else's room on the cruise ship. Sentence2: He saw a woman lying on the bed in lingerie. Sentence3: The woman beckoned him closer. Sentence4: Jim thought this couldn't be happening. Sentence5: He turned around and the woman's husband punched Jim.

Output: Woman, Jim, Woman's husband

Input: Consider Input: Sentence1: Sid wanted to succeed as a sketch artist. Sentence2: He practiced with sketching old paintings. Sentence3: They came out strangely proportioned. Sentence4: Sid's friends told him they were really humorous drawings. Sentence5: Sid began a successful business selling his sketches as caricatures.
Output: Friends, Sid