public static void main(String[] args) {
			Random gen = new Random();
			  for (int times = 0; times < 1000; ++times) {
			    String str = "";
			    if (args.length >= 1) {
			      str += args[0];
			      for (int i = 1; i < args.length; ++i) {
			        str += ' ';
			        str += args[i];
			      }
			    } else {
			      str = rand_string(gen.nextInt(10000));
			    }
			    System.out.println(str);
			    String reversed = reverse_words(str);
			    System.out.println(reversed);
			    check_answer(str, reversed);
			  }
		}