using System;

​

public class Program

{

    public static void Main()

    {

        try

        {

            string retur = "-6, Moscow, Domodedovo,30,4 / 3 / 2017 12:00:00 AM-7,Moscow,Vnukovo,30,4 / 3 / 2017 12:00:00 AM-9,Moscow,Vnukovo,40,4 / 3 / 2017 12:00:00 AM";

            Console.WriteLine(retur);

            string[] tokens = retur.Split('-');

            foreach (string s in tokens)

            {

                Console.WriteLine(s);

                if (!string.IsNullOrEmpty(s))

                {

                    string[] flyelem = s.Split(',');

                    int idf;

                    int frees;

                    if (int.TryParse(flyelem[0], out idf) &&

                        int.TryParse(flyelem[3], out frees))

                    {

                        string destf = flyelem[1];

                        string airf = flyelem[2];

                        string datef = flyelem[4];

                    }

                }

            }

        }

        catch (Exception ex)

        {

            Console.WriteLine(ex.ToString());

        }

    }

}