import java.util.regex.*;
import java.util.Scanner;

public class Email
{
        public static void main(String[] args)
        {
                System.out.println(Pattern.matches("^[\\w!#$%*/?|^{}'+\\-=_]+(\\.[\\w!#$%*/?|^{}'+\\-=_]+){0,1}@\\w+(\\.\\w+)*\\.(com|org|net|nu|se)$", new Scanner(System.in).nextLine()));
        }
}