#4ExtractEmails

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class ExtractEmails {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);
        String text = scan.nextLine();
        Pattern emailPattern = Pattern.compile(
                "[a-z0-9]+\\W?[a-z0-9]*?\\@[a-z]+\\w?[a-z]*?\\.[a-z]+\\.?[a-z]+");
        Matcher matcher = emailPattern.matcher(text);
        while(matcher.find()){
            System.out.println(matcher.group());
        }
    }

}