static void Main(string[] args)
{
int numberOfStrings = int.Parse(Console.ReadLine());
RecievList <Box <string> > elements = new RecievList <Box <string> >();
for (int i = 0; i < numberOfStrings; i++)
{
Box <string> boxOfStrings = new Box <string>(Console.ReadLine());
elements.Add(boxOfStrings);
}
string[] elementsToSwap = Console.ReadLine().Split();
int firstIndex = int.Parse(elementsToSwap[0]);
int secondIndex = int.Parse(elementsToSwap[1]);
elements.Swap(firstIndex, secondIndex);
foreach (Box <string> item in elements)
{
Console.WriteLine(item);
}
}
