using System;

​

public class Program

{

    public static void Main()

    {

        double num;

        Console.WriteLine("Enter first number");

        num = double.Parse(Console.ReadLine());

        while (num != 9.9)

        {

            Console.WriteLine("Enter other number");

            num = double.Parse(Console.ReadLine());

        }

​

        Console.WriteLine("finish");

    }

}