Definition: 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: Nan went out with a younger guy. Sentence2: She ended up falling for him. Sentence3: He liked her at first. Sentence4: Then he decided he needed space. Sentence5: He finally talked to her again after 4 days.
Output:
A younger guy, Nan