根据城市的地图，地图中的建筑物都是规则的矩形，地图中建筑物的数据有文本文件给出，包括每个建筑物西南角的坐标，南墙宽度，西墙宽度！求出所有南正视图（从南侧面看整个城市）能够看见的建筑物。-According to city maps, maps of the buildings are rectangular rule, the map data of buildings have a text file is given, including the coordinates of the southwest corner of each building, wall width, the width of the Western Wall! Calculated elevation of all the South (from the south side look of the city) to see buildings.