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: The high schoolers were excited for Chemistry class. Sentence2: They got to work in the lab. Sentence3: They did lots of experiments involving fire. Sentence4: When class was over, they went home to study. Sentence5: They wanted to be ready for the next class!
The high schoolers