#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <utility>

using namespace std;

int main() {
	int d;

	cin >> d;
	vector<int> a(d + 2, 0);
	for (int i = 0; i <= d; i++) {
		cin >> a[i];
	}

	// x^3 - x
	for (int i = d; i >= 3; i--) {
		a[i - 2] += a[i];
		a[i] = 0;
	}

	int maxd;
	if (a[2] != 0) {
		maxd = 2;
	} else {
		maxd = a[1] != 0 ? 1 : 0;
	}

	printf("%d\n", maxd);
	for (int i = 0; i <= maxd; i++) {
		printf("%d%c", a[i], i == maxd ? '\n' : ' ');
	}

	return 0;
}