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: 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.

Output: Yusuf, Woman

Input: Consider Input: Sentence1: Rick was at a restaurant. Sentence2: And he was curious about how all of the different items tasted. Sentence3: So he ordered way more than he could eat. Sentence4: And he forced himself to finish everything out of guilt. Sentence5: Rick tried to quell his curiosity the next time.

Output: Rick

Input: Consider Input: Sentence1: Barb was thrilled with the new recipe she'd created. Sentence2: The town was having a baking competition. Sentence3: She was entering banana flan. Sentence4: After the judges tasted each thing, they gave her a blue ribbon. Sentence5: Barb was so proud!
Output: Judges, Barb