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.
    String st = s.trim();
    if(st.length() == 0)
     System.out.println("0");
    else {
    String[] result = st.split("[ !,?._'@]+");
    System.out.println(result.length);
    for(String str : result)
     System.out.println(str);
    }
    scan.close();
}

}