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.
Q: Sentence1: I wore an elf hat to work one day. Sentence2: My co-worker laughed and said I looked like and elf. Sentence3: I told him that I was going for the elf look. Sentence4: The co-worker asked where I got the hat from. Sentence5: I refused to tell him because I wanted to be the only elf.
A:
I (myself), Co-worker