using System;

public class Program

{

    public static void Main()

    {

        int[] elements = new int[4]{1,2,3,4};

        Console.WriteLine(JoinArray("-", elements));

    }

        static string JoinArray(string separator, int[] numbers){

            string resposta = "";

            Array.Sort<>(numbers);

            for(int i= 0; i<numbers.Length; i++){

                if(i == numbers.Length -1){

                    resposta = resposta + numbers[i];

                }

                else{

                    resposta = resposta + numbers[i] + separator;

                }

            }

            return resposta;

        }

}