Definition: 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: Kathy had learned some new hair tricks. Sentence2: She read that coconut oil was great for hair. Sentence3: She tried it but something went wrong. Sentence4: Her hair came out horribly greasy. Sentence5: It turned out that she had used way too much oil
Output:
Kathy