Given the task definition and input, reply with output. 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: Tia was staying late at work. Sentence2: It took her a long time to get caught up on her work. Sentence3: By the time she left, the parking lot was empty. Sentence4: It was scary and poorly lit. Sentence5: Tia had to ask the security guard to walk her to her car.
Car, Work, Tia, Parking lot, Security guard