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: Susie was having a costume party. Sentence2: She invited all of her friends. Sentence3: She dressed up as a cat. Sentence4: Her friends loved it. Sentence5: Susie ended up winning the costume contest at the party.

Ex Output:
Susie, Her friends

Ex Input:
Sentence1: The monster truck driver eyed the ramp for his next stunt. Sentence2: He hit the gas and flew 30' in the air over a line of cars. Sentence3: The landing was rocky and so his truck went tumbling towards fans. Sentence4: Another driver blocked the fans but his truck to stop the other. Sentence5: The fans forgot the danger they were in and cheered like mad.

Ex Output:
Fans, Monster truck driver, Another driver

Ex Input:
Sentence1: John went camping with his friend Sentence2: They discovered that they forgot cups. Sentence3: They used pickle jars that they already had to drink. Sentence4: Their water tasted like pickles. Sentence5: They will remember to bring cups from now on.

Ex Output:
John, Friend