import java.util.Enumeration;
import java.util.Properties;
public class Main {
public static void main(String[] args) {
Properties prop = System.getProperties();
Enumeration enumeration = prop.keys();
while (enumeration.hasMoreElements()) {
String key = (String) enumeration.nextElement();
System.out.println(key + " = " + prop.getProperty(key));
}
}
}