G 139 Nanjing south railway station exit?

A number. According to Baidu map, G 139 is located on the east side of Nanjing South Railway Station Square, and Exit A is also located on the east side of Nanjing South Railway Station Square. Nanjing South Railway Station, located in Yuhuatai District, Nanjing City, Jiangsu Province, China, is a special passenger station under the jurisdiction of China Railway Shanghai Bureau Group Co., Ltd. It is the largest transportation hub in East China and an important part of Nanjing Railway Hub, the national railway hub.