// worked

import java.util.Arrays; import java.util.Scanner;

public class Solution {

public static void main(String[] args) {

Scanner in = new Scanner(System.in);
String s = in.nextLine();

String[] tokens = s.split("[ !,?._'@]+");
tokens = Arrays.stream(tokens).filter(token -> !token.isBlank()).toArray(String[]::new);

System.out.println(tokens.length);
for (String token : tokens) System.out.println(token);

} }