using System;

public class Program

{

    public static string[] vietel = new string[] {"086","096","097","098","032","033","034","035","036","037","038","039"};

    public static string[] vina = new string[] {"088","091","094","083","084","085","081","082"};

    public static string[] mobi = new string[] {"089","090","093","070","079","077","076","078"};

    public static string[] number = new string[10];

    public static void Main()

    {

        int i, phone;

        Console.WriteLine("nhap so mang");

        i = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("nhap so dien thoai");

        for ( phone = 0; phone < i; phone++)

        {

            Console.WriteLine("so dien thoai" +phone);

            number[phone] = Console.ReadLine();

                string k = ProcessOper(phone);

        switch (k)

        {

            case "1":

                Console.WriteLine("so viettel");

                break;

            case "2":

                Console.WriteLine("so vina");

                break;

            case "3":

                Console.WriteLine("so mobi");

                break;

            case "4":

                Console.WriteLine("khong thuoc nha mang nao");

                break;

        }

        }

        Console.ReadLine();

    }

    public static int ProcessOper(string phone)

    {

        int k;

       string so = number[phone];

        bool viettel = ProcessOperViettel(so);

        bool vina = ProcessOperVNP(so);

        bool mobi = ProcessOperVMS(so);

        if ( viettel == true )

        {

            return k = 1;

        }

        else if ( vina == true )

        {

            return k = 2;

        }

        else if ( mobi == true )

        {

            return k = 3;

        }

        else

        {

            return k = 4;

        }

    }

        public static int ProccesPhoneNumber(int phone)

    {

        phone = number.Length;

     return phone;

    }

    public static bool ProcessOperViettel(string so)

    {

        int i;

        for ( i = 0; i < vietel.Length ; i ++)

        {

        if (number[so] == vietel[i] )

        {

        return true;

        }

        }

    return false;

    }

        public static bool ProcessOperVNP(string so)

    {

        int i;

        for ( i = 0; i < vina.Length ; i ++)

        {

        if (number[so] == vina[i] )

        {

        return true;

        }

        }

    return false;

    }

            public static bool ProcessOperVMS(string so)

    {

        int i;

        for ( i = 0; i < mobi.Length ; i ++)

        {

        if (number[so] == mobi[i] )

        {

        return true;

        }

        }

    return false;

    }

}