static void Main()
{
Console.WriteLine("Enter phone model");
string phoneModel = Console.ReadLine();
Console.WriteLine("Enter phone manifacturer");
string phoneManifacturer = Console.ReadLine();
Console.WriteLine("Enter phone owner");
string phoneOwner = Console.ReadLine();
Console.WriteLine("Enter phone price");
float phonePrice = float.Parse(Console.ReadLine());
GSM phone = new GSM(phoneModel, phoneManifacturer, phoneOwner, phonePrice);
string info = phone.GetPhoneInfo();
Console.WriteLine(info);
}