instruction:
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.
question:
Sentence1: Alex had a young son. Sentence2: The boy was three years old. Sentence3: He still wasn't speaking. Sentence4: Alex told the doctor about his speech issue. Sentence5: Alex's son started to see a speech therapist.
answer:
Speech therapist, Alex, Young son, Doctor

question:
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.
answer:
A teenager, His mother, Tre

question:
Sentence1: Henry was not very good at school. Sentence2: He had a huge test coming up. Sentence3: He did not study at all for it. Sentence4: The day of the test is here and Henry starts the test. Sentence5: Henry is nervous and is caught cheating off another student.
answer:
Student, Henry