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.
    s=s.trim();
    if(s.isEmpty()){
        System.out.println(0);
        return ;

    }
    String[] token=s.split("[^A-Za-z]+");
    System.out.println(token.length);
   for(String arr:token){
    System.out.println(arr);

   }

    scan.close();
}

}