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.
Q: Sentence1: Bob borrows some money from a loan shark to pay off another debt. Sentence2: But when it comes time to pay he doesn't have the money. Sentence3: Out of desperation he robs a gas station. Sentence4: He gets the money to pay the loan shark. Sentence5: But he is caught and sentenced to ten years in jail for the robbery.
A:
Bob, Loan shark