Instructions: 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: Sentence1: Eli was singing loudly to Sia's Cheap Thrills. Sentence2: Suddenly there was a banging on the door! Sentence3: The neighbors had called the cops because of the noise. Sentence4: Eli was very embarrassed because he thought no one could hear him. Sentence5: Eli started listening to his music with headphones.
Output:
Neighbors, Eli