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: The train left the station and headed to the city of Chester. Sentence2: When it arrived there was a big crowd to welcome the train. Sentence3: Once the first person stepped off the train the crowd cheered. Sentence4: One traveler asked a person in the crowd why the commotion. Sentence5: The crowd member told him that they just love trains in Chester.
Output:
First person, Crowd member, Crowd, Traveler