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();
    scan.close();        

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

    String[] token = s.split("[^A-Za-z]+");

    System.out.println(token.length);

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

}

}