Scanner sc = new Scanner(System.in);
        
        String sent=sc.nextLine().trim();
        if(sent.length()>0){
            String [] words = sent.split("[ !,?._'@]+");
            System.out.println(words.length);
            for (String word:words)
                System.out.println(word);
        }else{
            System.out.println(0);
        }
        sc.close();