static Stack<int> RandStack (int size)
        {
            if (size < 1)
                throw new ArgumentException("Value of stacks parameter cannot be less than 1.", "value");

            Stack<int> mystack = new Stack<int>(size);
            Random rand = new Random();
            for (int i = 0; i < size; i++)
            {
                mystack.Push(rand.Next(0, 99));
            }
            return mystack;
        }