using System;

public class Program

{

    int[] prefix = new int[] {8, 9, 6};

    int Min = 0, Max = 9;

    int[] rand = new int[8];

    public void Main()

    {

        Console.Write("M or F >> ");

        String gender = Console.ReadLine();

        Console.Write("Enter your phone number >> ");

        String tel = Console.ReadLine();

        int[] telInt = new int[tel.ToString().Length]; 

        int telSum = 0; 

        Random rnd = new Random();

        int prefixIndex = rnd.Next(prefix.Length);

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

        {

            telInt[i] = telInt[i] * 10 + (tel[i] - 48);

            telSum += telInt[i];

            //Console.WriteLine(telInt[i]);

        }

        if ((gender == "F" && tel.Contains("7")) || (gender == "F" && telSum == 48))

        {

            RandNumforW(prefixIndex);

        }

        else if ((gender == "M" && tel.Contains("4")) || (gender == "M" && telSum == 43))

        {

            //RandNumforW();

        }

    }

    public void RandNumforW(int prefixIndex)

    {

        int sum = 0;

        Random randNum = new Random();

        String[] returnNum = {};

        Console.Write(prefix[prefixIndex] + "\n");

        //sum += prefix[];

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

        {

            rand[i] = randNum.Next(Min, Max);

            sum += rand[i];

            Console.WriteLine(rand[i]);

        }

        Console.WriteLine(returnNum);

    }

}