ArraysLabExtractMiddleElements

using System;
using System.Linq;

namespace RandomExercise
{
    class Program
    {
        static void Main()
        {
            {
                long[] nums = Console.ReadLine().Split(' ').Select(long.Parse).ToArray();

                if (nums.Length == 1)
                {
                    PrintOneElement(nums);
                    return;
                }
                else if (nums.Length % 2 == 0)
                {
                    PrintEvenElements(nums);
                }
                else if (nums.Length % 2 != 0)
                {
                    PrintOddElements(nums);
                }

                Console.WriteLine();
            }

        }

            static void PrintOneElement(long[] nums)
            {
                Console.WriteLine("{ " + $"{nums[0]}" + " }");
            }

            static void PrintEvenElements(long[] nums)
            {
                long first = nums.Length / 2 - 1;
                long second = nums.Length / 2;

                for (int i = 0; i < 1; i++)
                {
                    Console.Write("{ " + $"{nums[first]}, " + $"{nums[second]}" + " } ");
                }
            }

            static void PrintOddElements(long[] nums)
            {
                long first = nums.Length / 2 - 1;
                long second = nums.Length / 2;
                long third = nums.Length / 2 + 1;

                for (int i = 0; i < 1; i++)
                {
                    Console.Write("{ " + $"{nums[first]}, " + $"{nums[second]}, " + $"{nums[third]}" + " }");
                }
            }

    }
}