solution with all test cases passed import java.io.; import java.util.;

public class Solution {

public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);
    String s = scan.nextLine();
    // Write your code here.
    scan.close();

    if (s.isEmpty() || s==null) {   
        System.out.println(0);
    }

    if (s.length()>1 && s.length()<400000) {
    String news =  s.trim();
        if(news.length()>0){
        String arr[] = news.split("[\\s!,?._'@]+");

        int n=arr.length;

        System.out.println(n);
        for (int i = 0; i < n; i++) {
            System.out.println(arr[i]);
        }

        } else {
            System.out.println(0);
        }

    }else{
        System.out.println(0);
    }
}

}