Lab18-3

namespace ConsoleApp1
{
    class Program
    {
        static string excludeEachNSymbol(string line, int N)
        {
            string cutLine = string.Empty;
            for (int i = 0; i < line.Length; i++)
                if ((i + 1) % N != 0)
                    cutLine += line[i];
            return cutLine;
        }

        static void Main(string[] args)
        {
            Console.Write("Enter a line: ");
            string line = Console.ReadLine();
            if (line.Length % 2 == 0)
                Console.Write(excludeEachNSymbol(line, 2));
            else
                Console.Write("The string is of odd length.");
        }
    }
}