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: Consider Input: Sentence1: Dean's roof was damaged in the recent wind storm. Sentence2: He decided to fix the roof himself. Sentence3: He worked on it for two weeks before he asked for help. Sentence4: His friend Max came to help Todd finish the roofing project. Sentence5: Together they finished the roof and it looked amazing.

Output: Max, Dean

Input: Consider Input: Sentence1: John went to the horse races last weekend. Sentence2: He decided to bet on them. Sentence3: He started winning and bet even more. Sentence4: Eventually he lost everything he had won. Sentence5: He considered it breaking even and went home.

Output: John

Input: Consider Input: Sentence1: I always hated veggies on burgers. Sentence2: I always took them off. Sentence3: One day I kept the lettuce on. Sentence4: It tasted great. Sentence5: After that I always liked veggies on my burgers.
Output: I (myself)