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: Chris wanted to learn to rollerblade. Sentence2: He bought a pair of skates and strapped them on. Sentence3: Then he went outside to practice. Sentence4: At first he fell over and over. Sentence5: But soon Chris was skating just like an old pro!
Chris