import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        String str=sc.nextLine();
        String delimeter = "[!\\s,\\._'@?]+";
        String [] parts = str.trim().split(delimeter);
        List<String> tokenList = new ArrayList<>();
        for (String s : parts) { 
            if (!s.isEmpty()) { 
                tokenList.add(s); 
                } 
            }
        System.out.println(tokenList.size());
        for (String s : parts) {
            System.out.println(s);
        }
    }
}