16. Tricky Strings 2

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

namespace _16_Tricky_Strings
{
    class Program
    {
        static void Main(string[] args)
        {
            char delimiter = char.Parse(Console.ReadLine());
            int number = int.Parse(Console.ReadLine());
                        string[] sentence = new string[number];

  for (int i = 0; i < number; i++)
            {
sentence[i] = Console.ReadLine();
            }

            for (int m = 0; m < number; m++)
            {
                if (m == sentence.Length-1)
                {
                    Console.Write(sentence[sentence.Length-1]);
                }
                else
                {
                Console.Write(sentence[m] + delimiter);
                }
            }
            Console.WriteLine();
        }
    }
}