using System;

using System.Collections.Generic;

public class Program

{

    private static readonly HashSet<char> _allowedCharacters = new()

    {

        '>', '<','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',

        'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z',

        '1','2','3','4','5','6','7','8','9','0','!','@','#','$','%','^','&','*','(',')','`','~','-','_','=','+',

        '[',']','{','}','|',';',':','\'',',','.','/','?','£','€','¢',' ','"'

    };

    private static bool CanPassUnicodeCheck(string strMessage)

    {

        ReadOnlySpan<char> span = strMessage.AsSpan();

        for (int i = 0; i < span.Length; i++)

        {

            if (!_allowedCharacters.Contains(span[i]))

                return false;

        }

​

        return true;

    }

    public static void Main()

    {

        Console.WriteLine("CanPassUnicodeCheck: " + CanPassUnicodeCheck("Thank's guys <3"));

        Console.WriteLine("CanPassUnicodeCheck: " + CanPassUnicodeCheck("#everyonegetbackonthetrio"));

    }

}