using System;

using System.Text.RegularExpressions;                   

public class Program

{

    public static void Main()

    {

        /*

        1. Write a C# Sharp program to check whether a given string is a valid Hex code or not. Return true if this string is a valid code otherwise false.

        Sample Data:

        ("#CD5C5C") -> True

        ("#f08080") -> True

        ("#E9967A") -> True

        ("#EFFA07A") -> False

        */

        /*

        Console.Write("Enter Hex code: ");

        string text = Console.ReadLine();

        Regex reg = new Regex(@"^[#][0-9A-Fa-f]{6,7}$"); // ==> A B C D E F

        if (reg.IsMatch(text))

        {

            Console.WriteLine("Valid code");

        }

        else

        {

            Console.WriteLine("Invalid Code");

        }

        */

        //==================================================================================

        /*

        4. Write a C# Sharp program to validate a password of length 7 to 16 characters with the following guidelines:

        • Length between 7 and 16 characters.

        • At least one lowercase letter (a-z).

        • At least one uppercase letter (A-Z).

        • At least one digit (0-9).

        • Supported special characters: ! @ # $ % ^ & * ( ) + = _ - { } [ ] : ; " ' ? < > , .

        Sample Data:

        ("Suuu$21g@") -> True

        ("W#1g@") -> False

        ("a&&g@") -> False

        ("sdsd723#$Amid") -> True

        ("sdsd723#$Amidkiouy") -> False

        */

        Console.Write("Enter Password: ");

        string text = Console.ReadLine();

        Regex reg = new Regex(@"^\w+[!@#$%^&*()+=_-{}[]:;"'?<>,.]?{7,16}$"); 

        if (reg.IsMatch(text))

        {

            Console.WriteLine("Valid Password");

        }

        else

        {

            Console.WriteLine("Invalid Password");

        }

    }

}