using System;

using System.Text.RegularExpressions;

public class Program

{

    private const string passwordRegex = @"(?=.*[a-z])(?=.*[A-Z])^((?=.*\\d)|(?=.*[^a-zA-Z0-9]))(?!.*\\s).{10,20}$";

    private const string emailRegex = @"\b[\w\.-]+@.+\.\w{2,4}\b";

    public static void Main()

    {

        Console.WriteLine(!Regex.IsMatch("Checkeck1!", passwordRegex));

        Console.WriteLine(!Regex.IsMatch("rflyfrontier.com", emailRegex));

    }

}