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.

Ex Input:
Sentence1: The sink in my bathroom broke. Sentence2: I decided that I should fix it myself. Sentence3: After one hour, the sink looked worse than before. Sentence4: I finally decided to call a professional plumber. Sentence5: The plumber fixed the sink in ten minutes.

Ex Output:
I (myself), Professional plumber

Ex Input:
Sentence1: The county of Rochester needed a new park. Sentence2: The county council couldn't decide where to put it though! Sentence3: They couldn't afford the landscaping for one in the old empty lots. Sentence4: So they went to the city and asked for help. Sentence5: The city was glad to help, and soon Rochester had a new park.

Ex Output:
County council, City, County of rochester

Ex Input:
Sentence1: Felix was highly interested in life in the colonial United States. Sentence2: He loved going to reenactments and colonial fairs. Sentence3: He studied their ways of making goods and doing services. Sentence4: Eventually he found employment in colonial Williamsburg. Sentence5: It was a good educational opportunity, and a chance to share his love.

Ex Output:
Colonial williamsburg, Felix, Colonial united states