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: Iris put on blue contacts. Sentence2: She looked at herself in the mirror. Sentence3: She thought she looked weird. Sentence4: She replaced the contacts. Sentence5: She thought she looked better in brown.
Example Output: Iris

Example 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.
Example Output: Fans, Monster truck driver, Another driver

Example Input: Sentence1: Derek was a big fan of card games. Sentence2: He went to tournaments to win money. Sentence3: In this particular one, there were great players everywhere. Sentence4: He tried his best shot. Sentence5: He lost in the 5th round out of 30.
Example Output:
Great players, Derek