Detect the Email Addresses

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


public class Solution{

	public static void main(String[] args)
	{
		Scanner in = new Scanner(System.in);
		int n = Integer.parseInt(in.nextLine());
		
		Set<String> set = new HashSet<String>();
		ArrayList<String> emailList = new ArrayList<String>();
		String regex = "[\\w|_|.]+[@][\\w]+([\\.][\\w]+)+";
		Pattern pattern = Pattern.compile(regex);
		String string;
		for (int i = 0; i < n; i++) 
		{
			string = in.nextLine();
			Matcher matcher = pattern.matcher(string);
			while(matcher.find())
			{
				String tempEmail = string.substring(matcher.start(), matcher.end());
				set.add(tempEmail.trim());
			}
		}
		emailList.addAll(set);
		Collections.sort(emailList);
		StringBuffer strbuff = new StringBuffer();
		for(String email : emailList)
			strbuff.append(email+";");
		if(strbuff.length() > 1)
		{
			strbuff.deleteCharAt(strbuff.length() - 1);
			System.out.println(strbuff.toString());
		}
	}
	
}