// https://www.hackerrank.com/challenges/java-string-tokens/problem

import java.util.Arrays;

import java.util.Scanner;

public class JavaStringTokens {

public static void main(String[] args) {

Scanner scanner = new Scanner(System.in);

String string = scanner.nextLine().trim();

String[] tokens = string.split("[ ,?.!'_@]+");

System.out.println(string.length() == 0 ? "0" : tokens.length);

for (String token : tokens) {

System.out.println(token);

}

}

}