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: Neil was touring Istanbul. Sentence2: He joined his tour group in the morning. Sentence3: Then he went with them from stop to stop. Sentence4: He learned so much about Turkish history. Sentence5: Neil really loved his tour through Istanbul!

Output: Neil

Input: Consider Input: Sentence1: Bob hated his current cable provider. Sentence2: He decided to cancel the services. Sentence3: He started looking for a new provider. Sentence4: He found a great deal and bought it. Sentence5: His new provider was great!

Output: Bob, Bob's new cable provider

Input: Consider Input: Sentence1: The man had been feeling down. Sentence2: He took a test. Sentence3: The test said he was depressed. Sentence4: They gave him some medicine. Sentence5: The man felt better.
Output: Man