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: It was early December. Sentence2: My mom had been fighting cancer. Sentence3: She knew her time was near. Sentence4: She promised she would look after me in heaven. Sentence5: She died in her sleep.

Output: I (myself), My mom

Input: Consider Input: Sentence1: Fred carefully unhitched the rented trailer. Sentence2: As he went to strap on the chain he noticed a missing link! Sentence3: He ducked under the trailer to find the rest of the chain. Sentence4: Fred hadn't properly set the brake and it rolled backwards. Sentence5: He slowly starved to death and was eaten by wild animals.

Output: Fred

Input: Consider Input: Sentence1: Brian's I-phone wouldn't charge. Sentence2: He did not want to buy a new one. Sentence3: His wife researched on the internet. Sentence4: They decided to see if there was lint in the charging portal. Sentence5: After they cleaned the lint out, the Iphone charged normally.
Output: Brian, Wife