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: The county of Rochester needed a new park. Sentence2: The county council couldn't decide where to put it though! Sentence3: They couldn't afford the landscaping for one in the old empty lots. Sentence4: So they went to the city and asked for help. Sentence5: The city was glad to help, and soon Rochester had a new park.

Ex Output:
County council, City, County of rochester

Ex Input:
Sentence1: Darrel was sleeping peacefully. Sentence2: He had worked for 12 hours and was exhausted! Sentence3: He felt something wet and sticky on his face. Sentence4: His dog had missed him while he was at work. Sentence5: The dog wouldn't stop giving him kisses!

Ex Output:
Darrel, Dog

Ex Input:
Sentence1: Stacy was excited to be going to the state fair. Sentence2: She planned her day to take in every attraction. Sentence3: Then, Stacy smelled the aroma of deep-fried goodies. Sentence4: She stopped at each vendor to sample the wares. Sentence5: Two hours later, Stacy was back at the car with a belly ache.

Ex Output:
Vendor, Stacy