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: Although he pretended like he was tough, Mitchell was pretty cowardly. Sentence2: To test my theory, I placed a rubber spider next to his pillow. Sentence3: He went into his room to sleep and screamed when he found the insect. Sentence4: Rushing in, I found him him attacking the fake spider with bed sheets. Sentence5: I told him it was fake and laughed so hard I nearly choked.
Output:
I (myself), Mitchell