Instructions: 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.
Input: Sentence1: Tyron is headed home from basketball practice. Sentence2: He hears a noise coming from outside of his car. Sentence3: He decides to pull over and see what's going on. Sentence4: Tyron see's a metal spike in his tire. Sentence5: He calls his dad for help and waits.
Output:
Tyron, Dad