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

int main() {
    int d;
    cin >> d;
    vector<int> a(d + 1), b;
    for (auto i = 0; i <= d; i++) {
        cin >> a[i];
    }

    for (auto i = d; i >= 3; i--) {
        auto coef = a[i];
        a[i] -= coef;
        a[i - 2] += coef;
    }

    int degree = 0;
    for (auto i = 0; i < a.size(); i++) {
        if (a[i] != 0) degree = i;
        b.push_back(a[i]);
    }
    cout << degree << endl;
    for (auto i = 0; i <= degree; i++) {
        cout << (i == 0 ? "" : " ") << b[i];
    }
    cout << endl;

    return 0;
}