static void Main(string[] args)
{
Box <string> list = new Box <string>();
int n = int.Parse(Console.ReadLine());
for (int i = 0; i < n; i++)
{
var input = Console.ReadLine();
list.AddElement(input);
}
var indexes = Console.ReadLine().Split(" ", StringSplitOptions.RemoveEmptyEntries).Select(int.Parse).ToArray();
int firstElement = indexes[0];
int secondElement = indexes[1];
list.SwapElements(firstElement, secondElement);
Console.WriteLine(String.Join(Environment.NewLine, list));
}