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#include <iostream>
#include <vector>

using namespace std;

int DecToBin(int num);

int main() {
	
	int n;
	int i = 0;
	int totalBits = 0;
	vector<int> seq;

	cin >> n;

	while (totalBits < n) {
		i++;
		totalBits += DecToBin(i);
	}

	while (i > 0) {
		int bits = DecToBin(i);
		if (totalBits - bits < n) {
			seq.push_back(i);
		}
		else {
			totalBits -= bits;
		}
		i--;
	}

	cout << seq.size() << "\n";
	for (int i = 0; i < seq.size(); i++) {
		cout << seq[i] << " ";
	}
}

int DecToBin(int num) {
	int bits = 0;
	while (num > 0) {
		if (num % 2 == 1) {
			bits++;
		}
		num = num / 2;
	}
	return bits;
}