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();
    // Write your code here.
    String[] tokens = s.split("[^a-zA-Z]+");
    int n = tokens.length;
    if(n>0){
        n = tokens[0].isEmpty()?n-1:n;
    }
    System.out.println(n);
    for(String token : tokens){
        if(!token.isEmpty()){
            System.out.println(token);
        }
    }

    scan.close();
}

}