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();
        if(s.isEmpty())
        {
            System.out.println("0");
        }
        else
        {
        
        String[]arr=s.split("[ ,!?._'@]+");
        int count=arr.length;
        System.out.println(count);
        for(int i=0;i<arr.length;i++)
        {
            System.out.println(arr[i]);
        }
        } 
        scan.close();
        
    }
}