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: Michael raised dogs for dog racing. Sentence2: His favorite dog was getting old and ready to retire. Sentence3: To celebrate Michael set him up for one last race. Sentence4: His dog did a marvelous job and won the race. Sentence5: It made for a great final memory.
Output:
Michael, Dogs