Instructions: 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: Sentence1: Stewart was very self-conscious because he sweated heavily. Sentence2: So at the slightest sign of heat he stayed in front of a fan. Sentence3: As he had to go places, that was a problem very often. Sentence4: He'd be two minutes in the sun and arrive soaked at his destination. Sentence5: To remedy to the situation, he bought a portable small fan.
Output:
Stewart