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: Tom was driving across country. Sentence2: Tom noticed the gas needle was approaching empty. Sentence3: Tom looked diligently for a sign for gas, seeing none. Sentence4: Tom became worried he was too far from a filling station. Sentence5: Just in time, Tom saw and pulled into a gas station!
Tom