static Scanner s=new Scanner(System.in);
static String words[];
static String str;

void perform(int i)
{
    i++;

    if(i<(words.length-1))
    {
      perform(i);
    }

    System.out.print(words[i]+",");
}


public static void main(String[] args)
{
    Test t=new Test();
    str=s.next();
    words=str.split("\s+");
    System.out.println("Length of words is-"+words.length);
    //Output is always 1
    t.perform(-1);

}