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().trim();
    // Write your code here.
    if(!s.isEmpty()) {
    scan.close();
    String[] split = s.split("[ !,?._'@]+");
    System.out.println(split.length);
    for(int i = 0; i < split.length;i++) {
        System.out.println(split[i]);
    } 

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

} }