06. Middle Characters

using System;

namespace _06._Middle_Characters
{
    class Program
    {
        static void Main(string[] args)
        {
            string singalString = Console.ReadLine();
            bool isEven = true;
            FineMiddleCharecter(singalString, isEven);
        }

        static void FineMiddleCharecter(string singalString, bool isEven)
        {
            isEven = ChekEvenString(singalString, isEven);

            double middleSymbol = singalString.Length / 2;

            for (int i = 0; i < singalString.Length; i++)
            {
                if (isEven == false && i == middleSymbol)
                {
                    Console.WriteLine(singalString[i]);
                }
                if (isEven == true && i == middleSymbol)
                {
                    Console.Write($"{singalString[i-1]}{ singalString[i]}");
                    Console.WriteLine();
                }
            }
        }

        static bool ChekEvenString(string singalString, bool isEven)
        {
            if (singalString.Length % 2 != 0)
            {
                isEven = false;
            }
            return isEven;
        }


    }
}