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


public class _08_ExtractEmails {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        String input = sc.nextLine();
        Pattern regex = Pattern.compile("\\w+([.-_]+\\w+)*@\\w+([.]\\w+)+");
        Matcher matcher = regex.matcher(input);


        while(matcher.find()){
            System.out.println(matcher.group());
        }
    }

}