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: After a semester of hard work, I finally got an A in my math class. Sentence2: I had attended every lecture, no matter how boring it was. Sentence3: I did every homework assignment, even the difficult ones. Sentence4: Although I wanted to quit, I persevered through the class. Sentence5: I'm proud of my grade.
I (myself)