#include <bits/stdc++.h>
using namespace std;

void fast_io() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
}

int main() {
	fast_io();
	int n;
	long long x, y;
	cin >> n >> x >> y;
	if (x == y) {
		cout << "0\n\n";
		return 0;
	}
	if (y % 2 == 0) {
		cout << "-1\n";
		return 0;
	}
	vector<int> ans(1, n);
	vector<int> sigs;
	for (int i = n - 1; i >= 0; i--) {
		if ((y >> i) & 1) {
			sigs.push_back(i);
		}
	}
	for (int i = 0; i < (int)sigs.size() - 1; i++) {
		ans.push_back(sigs[i] - sigs[i + 1]);
	}
	cout << ans.size() << '\n';
	for (int i : ans) {
		cout << i << ' ';
	}
	cout << endl;
}