What is the initial letter of Lincang fire license plate in Yunnan?

Yunnan Province, called Yun or Dian for short, is one of the 23 provinces in China, located in the southwest of China, with Kunming as the capital. The number of characters of the license plate code is 2, which consists of Chinese characters and English letters respectively, with cloud R as Diqing and cloud S as Lincang. Yunnan Lincang fire license plate starts with the letter cloud S. The license plate, namely the license plate, is a number plate hanging in front of and behind the car.