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: Gina had money, but no way to the store to use it. Sentence2: She wondered if she should ask her grandpa for a ride. Sentence3: He was on the porch napping. Sentence4: She thought it would be rude to wake him. Sentence5: She played Monopoly with her sisters until he woke up.
Gina, Grandpa