#include "bits/stdc++.h"

using namespace std;

#define ll long long
#define vi  vector<int>
#define vvi vector<vi>
#define pi  pair<int,int>
#define mp  make_pair
#define pb  push_back
#define MOD 1e9 + 7
#define PAI  3.1415
#define all(x) (x).begin(),(x).end()
#define chmax(x,y) x = max(x,y)
#define chmin(x,y) x = min(x,y)
#define pr(x) cout << x << endl
#define Endl endl
#define rep(i,n) for(int i = 0 ; i < n; i++)

const int dx[4] = {1,0,-1,0};
const int dy[4] = {0,1,0,-1};
const int ddx[8] = {-1,0,1,-1,1,-1,0,1};
const int ddy[8] = {-1,-1,-1,0,0,1,1,1};
const int inf = 99999999;
const ll linf = 1LL << 62;

ll gcd(ll a,ll b){
  if(a < b)swap(a , b);
  if(a % b != 0) gcd(b, a%b);
  return b;
}

ll lcm(ll a,ll b){
  if(a < b)swap(a , b);
  return (a/gcd(a , b)) * b;
}

int main(){
 
  int d; cin >> d;
  vi v(10005);

  rep(i, d + 1)
    cin >> v[i];
  
  for(int i = d; i >= 3; i--){
    
    v[i - 2] -= -v[i];
    v[i] = 0;
  }
    
  bool x2 = (v[2] != 0) ? true : false;
  bool x1 = (v[1] != 0) ? true : false;

  if(x2){
    pr('2');
    cout << v[0] << ' ' << v[1] << ' ' << v[2]  << endl;
  }
  else if(!x2 and x1){
    pr('1');
    cout << v[0] << ' ' << v[1] << endl;
  }
  else{
    pr('0');
    pr(v[0]);
  }

  return 0;
}