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: Alfred hated how hot the beach sand was. Sentence2: He found wearing sandals in the sand equally unpleasant. Sentence3: He was determined to invent a solution. Sentence4: Alfred devised a heat-resistant lotion for his feet. Sentence5: He tried to gather capital to bring it to market but failed.

Output: Alfred

Input: Consider Input: Sentence1: Ben put his running shoes on. Sentence2: He ran out of the door in a hurry. Sentence3: He tripped on the top step. Sentence4: He barely stopped himself from falling down the stairs. Sentence5: He slowed his running pace.
Output: Ben