MiddleCharacters

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MiddleCharacters
{
    class Program
    {
        static void Main()
        {
            string input = Console.ReadLine();

            if(input.Length % 2 == 1)
            {
                PrintOddMiddleCharacter(input);
            }
            else
            {
                PrintEvenMiddleCharacters(input);
            }
        }
        public static void PrintOddMiddleCharacter(string input)
        {
            int middle = input.Length / 2;
            char middleChar = input[middle];

            Console.WriteLine(middleChar);
        }
        public static void PrintEvenMiddleCharacters(string input)
        {
            int middle = input.Length / 2;
            Console.WriteLine($"{input[middle-1]}{input[middle]}");
        }

    }
}