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();

    s = s.trim();
    String token[] = s.split("[ !,?._'@]+");

    if(s.length() == 0)
    {
        System.out.println(0);
    }else{
        System.out.println(token.length);
    }

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

    scan.close();
}

}