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.

Example Input: Sentence1: Tom ran for a local election. Sentence2: He was running as a protest candidate. Sentence3: The two main candidates were brought down by scandals. Sentence4: There wasn't enough time to replace them. Sentence5: Tom wound up winning the election.
Example Output: Two main candidates, Tom

Example Input: Sentence1: Yusuf was startled by a loud knocking at his door at a late hour. Sentence2: He wasn't expecting company, and grabbed his gun. Sentence3: A shivering woman greeted him when he opened the door. Sentence4: She had hit black ice and her car had slid off the road. Sentence5: Yusuf called a tow truck for her, and let her warm up in his house.
Example Output: Yusuf, Woman

Example Input: Sentence1: Tina went to the beach with her friend. Sentence2: Her friend was smart and put some sunscreen on. Sentence3: But Tina did not decide to wear any. Sentence4: So as a result she got a bad burn. Sentence5: Tina then learnt her lesson.
Example Output:
Tina's friend, Tina