Retell the story of the charcoal seller in 60 words.

An old man selling charcoal is chopping wood and burning charcoal in Zhong Nanshan. His face is covered with dust, showing the color of smoke and fire. His temples are gray and his ten fingers are black. What is the money for selling charcoal for? Buy clothes to wear and food to eat in your mouth. I pity him for wearing thin clothes, but I am worried that the price of charcoal is cheap, and I hope the weather will be colder. It snowed a foot thick outside the city at night. In the morning, the old man drove a charcoal cart and ran over a frozen rut. The sun has risen very high, people and cows are tired and hungry, and the old man is resting in the mud outside the south gate of the market. Who are the two victorious riders? They are eunuchs in the palace and their minions. He held the imperial edict in his hand and said it was the emperor's order. Then he turned around and shouted at the cattle in the north. A load of charcoal, 1000 kilograms, the messenger of the palace insisted on taking it away, but the old man could not bear it, but he could do nothing. The messenger in the palace hung half a horse's yarn and a column of silk on the cow's head as the price of charcoal.