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: Sue entered a nacho eating contest. Sentence2: Nachos are her favorite food so she thought she could do well. Sentence3: Sue started off slow to pace herself. Sentence4: She then upped the ante. Sentence5: Sue ate 15 pounds of nachos but did not win.

Output: Sue

Input: Consider 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.

Output: Colonial williamsburg, Felix, Colonial united states

Input: Consider Input: Sentence1: Matt began his exercise routine by stretching. Sentence2: He was excited already, but he was anxious when Mia joined him. Sentence3: She smiled and handed him a jump rope. Sentence4: Time for their weekly challenge, he thought, beginning to jump. Sentence5: He jumped fifty times before stopping.
Output: Mia, Matt