import java.io.*;
import java.util.*;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
public class Solution {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt(); scanner.nextLine();
        // Before and After @: (word.word.word...), with atleast one word, where each word is \w+
        Pattern pattern = Pattern.compile("\\w+(\\.\\w+)*@\\w+(\\.\\w+)*"); 
        // Creating hashset to hold unique emails
        HashSet<String> hashset = new HashSet<String>();
        for (int i=0;i<n;i++) {
               Matcher matcher = pattern.matcher(scanner.nextLine());
               while(matcher.find())    hashset.add(matcher.group());
        }
        // Converting hashset to arraylist in order to use sort()
        ArrayList arraylist = new ArrayList<String>(hashset);
        // Sorting arraylist in lexicographical order
        Collections.sort(arraylist);
        // Using ListIterator to iterate through arraylist
        ListIterator<String> iterator = arraylist.listIterator();
        while(iterator.hasNext()) {
            System.out.print(iterator.next());
            if(iterator.hasNext())  System.out.print(";");
        }
    }
}