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: Joshua moved to a new neighborhood. Sentence2: He had a lot of fun neighbors. Sentence3: He stood outside and drank a beer and talked to them. Sentence4: Then he drank a few more and talked longer. Sentence5: Soon he was out of beer and ready to go inside.

Output: Joshua, Neighbors

Input: Consider Input: Sentence1: Ella wrote her grandma a letter. Sentence2: She went to the post office to mail it. Sentence3: But they told her she needed a stamp! Sentence4: A kind stranger gave little Ella the stamp. Sentence5: Ella happily posted her letter.

Output: Ella, Stranger, Grandma

Input: Consider Input: Sentence1: Eric looked everywhere for his missing iPod. Sentence2: He strip searched his room to no avail. Sentence3: He checked the rest of his apartment to no avail. Sentence4: Eric was sad, as he really loved that iPod. Sentence5: However, when he sorted his laundry, he found the iPod in his pocket!
Output: Eric