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: Julia was looking for her very favorite blouse. Sentence2: When she didn't find it she went to ask her sister. Sentence3: To her surprise her sister was wearing the shirt. Sentence4: She refused to take it off and Julia attacked her. Sentence5: Their dad broke it up and took the shirt away for good.

Ex Output:
Dad, Sister, Julia

Ex Input:
Sentence1: Jake moved to a new city. Sentence2: It was in an area with tornadoes. Sentence3: Jake had never experienced them before. Sentence4: The first time he had to deal with one was traumatizing. Sentence5: Jake decided to move back.

Ex Output:
Jake

Ex Input:
Sentence1: Sam wanted to watch television. Sentence2: He couldn't find the remote to turn it on. Sentence3: He looked in a lot of places. Sentence4: Eventually he looked in the kitchen and found it on the counter. Sentence5: Sam didn't know how it got there but was glad he found it.

Ex Output:
Sam