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[] s1=s.split("[^a-zA-Z]+");
    System.out.println(s1.length);

    for(String x:s1){
        if (!x.isEmpty()) { // Avoid empty strings
            System.out.println(x);
        }
    }
    scan.close();
}

}