Winning Ticket - String And Text Proccessing

using System;
using System.Linq;

namespace _06WinningTicket
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] tickets = Console.ReadLine().Split(new[] { ',', ' ' }, StringSplitOptions.RemoveEmptyEntries);

            foreach (var ticket in tickets)
            {
                if (ticket.Length!=20)
                {
                    Console.WriteLine("invalid ticket");
                    continue;
                }

                string leftHalf = ticket.Substring(0, 10);
                string rightHalf = ticket.Substring(10);

                int length = 0;
                char bestSymbol = ' ';

                for (int i = 6; i <=10; i++)
                {
                    if (leftHalf.Contains(new string('@',i)) && rightHalf.Contains(new string('@',i)))
                    {
                        length = i;
                        bestSymbol = '@';
                    }
                    else if (leftHalf.Contains(new string('$', i)) && rightHalf.Contains(new string('$', i)))
                    {
                        length = i;
                        bestSymbol = '$';
                    }
                    else if (leftHalf.Contains(new string('#', i)) && rightHalf.Contains(new string('#', i)))
                    {
                        length = i;
                        bestSymbol = '#';
                    }
                    else if (leftHalf.Contains(new string('^', i)) && rightHalf.Contains(new string('^', i)))
                    {
                        length = i;
                        bestSymbol = '^';
                    }
                }

                if (length==0)
                {
                    Console.WriteLine($"ticket \"{ticket}\" - no match");
                }
                else if (length ==10)
                {
                    Console.WriteLine($"ticket \"{ticket}\" - {length}{bestSymbol} Jackpot!");
                }
                else
                {
                    Console.WriteLine($"ticket \"{ticket}\" - {length}{bestSymbol}");
                }
            }
        }
    }
}