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.

[Q]: Sentence1: Cal shivered in a t-shirt as the snow fell on him. Sentence2: The weather forecast had called for seventy degrees and sunny. Sentence3: It was twenty degrees and very cloudy with snow. Sentence4: Cal didn't have time to go back inside and grab a jacket. Sentence5: He ran all the way to his car and turned on the heat full blast!
[A]: Cal

[Q]: Sentence1: Tre's bicycle really needed new brakes. Sentence2: Tre saved up all his allowance to take his bike to the shop. Sentence3: On the way a teenager jumped Tre and stole all his money and his bike. Sentence4: Tre walked home crying and empty handed. Sentence5: When he got there he found his mother dead.
[A]: A teenager, His mother, Tre

[Q]: Sentence1: Edward was a substitute school teacher. Sentence2: He hated his job. Sentence3: He could never get his substitute students to quiet down. Sentence4: One day , he bought a whistle so he could use it in class. Sentence5: Edward got fired after using it on his first day.
[A]:
Students, Edward