Instructions: 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: Sentence1: Kay was washing clothes when she heard the washer stop. Sentence2: She assumed the load finished and went to change it to the dryer. Sentence3: She was confused to see water in the washer. Sentence4: She tried to turn it on but the washer wouldn't come back on. Sentence5: Kay had to wring her clothes out by hand to finish her laundry.
Output:
Kay