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.

Example 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.
Example Output: Joshua, Neighbors

Example 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.
Example Output: Colonial williamsburg, Felix, Colonial united states

Example Input: Sentence1: Suzanne had a Halloween party. Sentence2: She asked all of her guests to come in costume. Sentence3: She said that a prize would be given for the best costume. Sentence4: A boy named Dave came dressed as a girl. Sentence5: His costume was so convincing he won first prize in the contest.
Example Output:
Dave, Suzanne, Guests