import java.io.FileOutputStream;
import java.util.Map;
import java.util.Properties;
import java.util.TreeMap;
public class List {
public static void main(String args[]) throws Exception {
Properties p = System.getProperties();
p.list(System.out);
FileOutputStream fos = new FileOutputStream("sys.out");
p.store(fos, null);
fos.close();
Map map = new TreeMap(p);
System.out.println(map);
}
}