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: Ellen had tried a new soap her friend recommended. Sentence2: Her skin soon began to be itchy and red. Sentence3: Rashes developed on her skin. Sentence4: Ellen went to see her doctor. Sentence5: The doctor determined she was allergic to her new soap.
Output:
Rashes, Ellen, Friend, Doctor