Shuffle Bits

using System;

class ShuffleBits
{
    static void Main()
    {
        uint first = uint.Parse(Console.ReadLine());
        uint second = uint.Parse(Console.ReadLine());

        string firstToString = Convert.ToString(first, 2).PadLeft(32, '0');
        string secondToString = Convert.ToString(second, 2).PadLeft(32, '0');
        string result = string.Empty;

        if (first >= second)
        {
            for (int i = 0; i < 32; i++)
            {
                result += firstToString[i].ToString();
                result += secondToString[i].ToString();
            }
        }
        else
        {
            for (int i = 0; i < 32; i += 2)
            {
                result += firstToString[i].ToString();
                result += firstToString[i + 1].ToString();

                result += secondToString[i].ToString();
                result += secondToString[i+1].ToString();
            }
        }

        ulong output = 0;
        for (int i = 63; i >= 0; i--)
        {
            output |= ulong.Parse(result[i].ToString()) << (63-i);
        }
        Console.WriteLine(output);
    }
}