import com.sun.security.jgss.GSSUtil;

import javax.swing.*;
import javax.xml.stream.events.Characters;
import java.lang.reflect.Array;
import java.sql.SQLOutput;
import java.text.DecimalFormat;
import java.util.*;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.stream.Collector;
import java.util.stream.Collectors;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class Test {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String[] input = sc.nextLine().split(",\\s");
        ArrayList<String> valid = new ArrayList<>();
        for (String pass : input) {
            for (int i = 0; i < pass.length(); i++) {
                char something = pass.charAt(i);
                    if (pass.length() >= 3 && pass.length() <= 16&&!valid.contains(pass)) {
                        if (Character.isLetterOrDigit(something) || something == '-' || something == '_') {
                            valid.add(pass);
                            break;
                        } else {
                            break;
                        }
                    }
                }
            }
            String separated = String.join("\n", valid);
            System.out.print(separated);
        }
    }