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: I had a big exam to take last week. Sentence2: I had been studying for it for days. Sentence3: The night before the exam I decided to review my notes one more time. Sentence4: I lost track of time and stayed up too late. Sentence5: I was so sleepy the next morning I almost was late for the exam!
Output:
I (myself)