import java.io.; import java.util.; import java.util.stream.*;

public class Solution {

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


    List<String> token = Arrays.asList(s.split("[ !,?._'@]"))
        .stream()
        .map(x -> x.trim())
        .filter(x -> !x.isEmpty())
        .collect(Collectors.toList());

    System.out.println(token.size());
    for (String t: token){
        System.out.println(t);
    }

    scan.close();
}

}