Given the task definition and input, reply with output. 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: Kyle stood nervously in front of the 140 students. Sentence2: He was introduced by the professor in charge of the class. Sentence3: He wished he had brought water because his mouth felt full of cotton. Sentence4: It was time, and he opened his mouth, hoping words would come out. Sentence5: They did, and the professor praised him for how well his lecture went.
Students, Professor, Kyle