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.

Input: Consider Input: Sentence1: Maude always used old maps to find her way while driving. Sentence2: But this time she couldn't find her target. Sentence3: Maude pulled her phone and found the location using GPS. Sentence4: And as she exited her car, she threw her old map away. Sentence5: From now on, she'd use her phone to find her way.

Output: Maude

Input: Consider Input: Sentence1: Randy was out jogging one morning. Sentence2: Then suddenly, the world began to look different. Sentence3: He realized he had lost a contact lens. Sentence4: He went back to check and see if he could find it. Sentence5: Sadly, though, Randy's lens was gone for good.

Output: Randy

Input: Consider Input: Sentence1: Bob bought a tractor one day. Sentence2: He used it for pulling logs back to his farm house. Sentence3: Bob would then cut the wood and sell it. Sentence4: He made enough money to pay for the tractor. Sentence5: Bob is glad he purchased the tractor.
Output: Bob