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: Zaddy Tracks is a black cat. Sentence2: He is over ten years old. Sentence3: Last spring he got very sick. Sentence4: He went to the veterinarian who gave him some pills for his liver. Sentence5: Zaddy Tracks got better.

SOLUTION: Zaddy, Veterinarian

PROBLEM: Sentence1: Jerry asked if his friend can pay him for climbing the monkey bars. Sentence2: They agreed to hand him $10 dollars each. Sentence3: He grabbed the first bar and climbed across. Sentence4: His hand ended up slipping on one of the bars. Sentence5: He landed on the ground, with his stomach falling first.

SOLUTION: Jerry, Friend

PROBLEM: Sentence1: Joey's and his wife have a toddler. Sentence2: They decided it was time to get the child to potty train. Sentence3: Joey tried everything to get their child to learn. Sentence4: He hired an expert to help. Sentence5: Now their child goes to the bathroom unassisted.

SOLUTION:
An expert, His wife, A toddler, Joey