static void Main(string[] args)
{
Console.WriteLine("Write method to add 2 positive integer numbers represented as arrays of digits");
Console.WriteLine("(each array element arr[i] contains a digit; the last digit is kept in arr[0]).");
Console.WriteLine("Each of the numbers that will be added could have up to 10 000 digits.\n");
Console.Write("Enter the first number: ");
BigNumber first = new BigNumber(Console.ReadLine());
Console.Write("Enter the second number: ");
BigNumber second = new BigNumber(Console.ReadLine());
Console.WriteLine(first + second);
}
