import java.lang.String;
public class EmailValidator  
{
	public static void main(String[] args) 
	{String s=new String();
	s=args.toString();
	System.out.println(s);
	validate(s);
	
	}
	public static void validate(String e)
	{
	if(e.charAt(0)!='@'&&e.charAt(e.length()-1)!='@')
		System.out.println(e+" : right!");
	else
		System.out.println(e+" : error");
	
	}
	
}