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: Alfred hated how hot the beach sand was. Sentence2: He found wearing sandals in the sand equally unpleasant. Sentence3: He was determined to invent a solution. Sentence4: Alfred devised a heat-resistant lotion for his feet. Sentence5: He tried to gather capital to bring it to market but failed.
Example Output: Alfred

Example Input: Sentence1: Shy was starting college. Sentence2: She was nervous but excited. Sentence3: She wondered if she would like her classes. Sentence4: On her first day, she met many new friends. Sentence5: Shy realized she would love college, after all!
Example Output: Shy, Friends, College

Example Input: Sentence1: I went to the casino last week. Sentence2: My friend was playing poker. Sentence3: I was playing slot machines. Sentence4: My friend lost five hundred dollars. Sentence5: I won two hundred dollars
Example Output:
I (myself), Friend