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: Troy had not seen his family in years. Sentence2: Troy had been living in another country. Sentence3: He longed to see his family. Sentence4: He bought a plane ticket. Sentence5: He visited his family on Thanksgiving.

Output: Troy, Family

Input: Consider Input: Sentence1: Marie was stuck in traffic and playing a game on her phone. Sentence2: Someone tapped on her window and she recognized a cop. Sentence3: He told her to stop playing and pay attention. Sentence4: She apologized and pocketed her phone. Sentence5: She regretted it as it took an hour for the traffic to move again.

Output: Cop, Marie

Input: Consider 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