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.

Ex Input:
Sentence1: Jill was lost in the wilderness. Sentence2: She had been hiking by herself and got separated from the trail. Sentence3: Her boyfriend called the police after not hearing from her. Sentence4: A search team was dispatched to the GPS coordinates on her phone. Sentence5: A helicopter found and rescued Jill near a large tree.

Ex Output:
Jill, Police, Boyfriend

Ex Input:
Sentence1: Connie has not studied for her exams. Sentence2: In a panic she sits near the smartest girl in glass. Sentence3: As the exam is handed out she slowly works through her exam. Sentence4: She's copying the girl next to her. Sentence5: Connie gets caught and is expelled from university.

Ex Output:
Smartest girl, Connie

Ex Input:
Sentence1: Amy's coffee buzz had worn off and she was crashing hard. Sentence2: She felt no better after lunch. Sentence3: In fact she may have felt worse. Sentence4: She lay her head on the table until the bell rang. Sentence5: Amy had no clue how she was ever going to survive this day.

Ex Output:
Amy