public static void Main(string[] args) { var counter = int.Parse(Console.ReadLine()); var box = new Box <int>(); for (int i = 0; i < counter; i++) { var command = int.Parse(Console.ReadLine()); box.AddElements(command); } var command2 = Console.ReadLine().Split(); var firstIndex = int.Parse(command2[0]); var secondIndex = int.Parse(command2[1]); box.SwapElements(firstIndex, secondIndex); Console.WriteLine(box.ToString()); }