#include <iostream>
#include <vector>
using namespace std;

int main()
{
	int D; vector<int> a;

	cin >> D;
	a.resize(D + 1);
	for (int i = 0; i <= D; ++i)
	{
		int tmp;
		cin >> tmp;
		a[D - i] = tmp;
	}

	while (3 < a.size())
	{
		int first = a[0], second = a[1], third = a[2];
		third = third + first;
		if (second != 0)
		{
			a[2] = third;
			a.erase(a.begin(), a.begin() + 1);
		}
		else
		{
			a[2] = third;
			a.erase(a.begin(), a.begin() + 2);
		}
	}

	while (1 < a.size() && a[0] == 0)
	{
		a.erase(a.begin(), a.begin() + 1);
	}
		
	cout << a.size() - 1 << endl;
	for (int i = 0; i < a.size(); ++i)
	{
		cout << a[a.size() - 1 - i];
		if (i != a.size() - 1)
			cout << " ";
		else
			cout << endl;
	}

	return 0;
}