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: Ronnie was driving a large truck on the highway. Sentence2: He was tired and wasn't paying attention to the signs. Sentence3: He failed to see the sign that warned of a low overpass ahead. Sentence4: Ronnie's truck was too tall to clear the overpass. Sentence5: Ronnie got fired after he wrecked the truck.
Ronnie