public static void Main()
Console.WriteLine((plant?.ToString().PadLeft(4, '0')));
Console.WriteLine((plant?.ToString().PadLeft(4, '0')));
Console.WriteLine((plant?.ToString().PadLeft(4, '0')));
Console.WriteLine((plant?.ToString().PadLeft(4, '0')));
Console.WriteLine((plant?.ToString().PadLeft(4, '0')));