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: Jeff is carrying is walking across the street. Sentence2: A car comes and hits him. Sentence3: He goes soaring through the air. Sentence4: Jeff lands on his feet. Sentence5: Jeff is uninjured and finishes walking across the street.

Output: Jeff

Input: Consider Input: Sentence1: Linda was intrigued by music of all sorts. Sentence2: She particularly enjoyed guitar solos. Sentence3: Linda dreamed of being able to play the guitar. Sentence4: She bought a guitar at a local pawn shop. Sentence5: Linda can now play all of her favorite songs.

Output: Linda

Input: Consider Input: Sentence1: John grew up stocking freezers for his parent's business. Sentence2: He would slide bottles of water and soft drinks onto the shelves. Sentence3: For many years he did this simple to task to help his parents. Sentence4: He eventually grew tired of it. Sentence5: But now he is very resilient to the cold.
Output: John, His parents