#include "bits/stdc++.h"
using namespace std;
#define ll long long int
#define rep(i,n) for( int i = 0; i < n; i++ )
#define rrep(i,n) for( int i = n; i >= 0; i-- )
#define REP(i,s,t) for( int i = s; i <= t; i++ )
#define RREP(i,s,t) for( int i = s; i >= t; i-- )
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define INF 2000000000
#define mod 1000000007
#define INF2 1000000000000000000


int main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
	int D; cin >> D;
	int a[10010];
	int b[4] = { 1, 0, -1, 0 };
	rep(i, D + 1) cin >> a[i];
	RREP(i, D, 3) {
		int tmp = a[i];
		rep(j, 4) {
			a[i - j] -= b[j] * tmp;
		}
		//rep(j, D + 1) {
		//	cout << a[j] << " ";
		//}
		//cout << endl;
	}
	int k = 2;
	while (k > 0 && a[k] == 0) k--;
	cout << k << endl;
	rep(i, k + 1) {
		if (i != 0) cout << " ";
		cout << a[i];
	}
	cout << endl;


    return 0;
}