Read the excerpt from Cao Chong Weighs an Elephant. Then answer the question below.
Cao Chong: Now I will add up the weight of all the stones. Father, I have calculated the elephant's exact weight. It is 9,398 jin!
Narrator 1: The crowd clapped and cheered. Even the elephant seemed pleased. It raised its trunk to blow water into the air.
Cao Cao: (hugging his son) Clever thinking, my son. You have solved the riddle of the elephant's weight and proven the intelligence of our kingdom to the whole world!
Who are the characters?