public class Solution {

public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);
    String s = scan.nextLine();
    scan.close();
    if (s.trim().isEmpty()) {
        System.out.println(0);
    }
    else{
    String[] splitString = (s.replaceAll("^\\W+", "").split("[\\s!,?._'@]+"));
    System.out.println(splitString.length);
    for (String string : splitString) {
        System.out.println(string);
    }
    }
}

}