Solved

public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);
    String s = scan.nextLine();
    // Write your code here.
    String[] arrayTemp = s.split("[ !,?._'@]+");
    StringBuffer strResult = new StringBuffer();
    int count = 0;
    for(int i = 0; i < arrayTemp.length; i++){
        if(arrayTemp[i].matches("[A-Za-z]+")){
            count++;
            strResult.append(arrayTemp[i]+"\n");
        }
    }
    System.out.println(count+"\n"+strResult);    

    scan.close();
}