TASK 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.
PROBLEM: Sentence1: Yusuf was startled by a loud knocking at his door at a late hour. Sentence2: He wasn't expecting company, and grabbed his gun. Sentence3: A shivering woman greeted him when he opened the door. Sentence4: She had hit black ice and her car had slid off the road. Sentence5: Yusuf called a tow truck for her, and let her warm up in his house.

SOLUTION: Yusuf, Woman

PROBLEM: Sentence1: Alvin's wife had been on a diet. Sentence2: He didn't like any of the food she had been cooking. Sentence3: Alvin would stop and pick up a burger on the way home from work. Sentence4: He ate very little of what she cooked. Sentence5: Alvin's wife lost weight, but he gained it.

SOLUTION: Alvin, Wife

PROBLEM: Sentence1: Kyle was going to take his school pictures in the morning. Sentence2: He was walking to school and tripped. Sentence3: Kyle fell and skinned his chin on the sidewalk. Sentence4: He tried cleaning his chin but it was obvious. Sentence5: Kyle's picture showed the scratches on his chin.

SOLUTION:
Kyle