using System;
using System.Text.RegularExpressions;

class Program
{
    static void Main()
    {
        Console.WriteLine("请输入您的电子邮件地址：");
        string email = Console.ReadLine();

        if (IsValidEmail(email))
        {
            Console.WriteLine("输入的电子邮件地址有效！");
        }
        else
        {
            Console.WriteLine("输入的电子邮件地址无效！");
        }
    }

    static bool IsValidEmail(string email)
    {
        string emailRegex = @"^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$";
        return Regex.IsMatch(email, emailRegex);
    }
}