Q: 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.
Sentence1: Marcus had a strange growth on his side. Sentence2: It kept growing and formed a horn shape. Sentence3: Marcus got out a saw and chopped it off. Sentence4: He carved out the inside and made an instrument. Sentence5: Now he sits on his roof playing his horn every morning.
A:
Marcus