#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES

#ifdef __unix__
#include <bits/stdc++.h>
#else
#include "bits\stdc++.h"
#endif
#include <vector>
#include <set>
#include <string>
#include <queue>
#include <list>
#define REP(i,a,b) for(i=a;i<b;i++)
#define rep(i,n) REP(i,0,n)
using namespace std;
#define VI vector<int>
#define ll long long
#define ull unsigned ll
typedef long double ld;
#define SQR(X) ((X)*(X))

#define MAX 10005

int main() {
  int i,j,k,l;
  int D;
  int a[MAX];
  cin >> D;
  rep(i,D+1) cin >> a[i];
  rep(i,(D+1)/2) swap(a[i],a[D-i]);
  // rep(i,D+1) cout << a[i] << " ";
  // cin >> D;
  rep(i,D-2) {
    a[i+2] += a[i];
  }
  
  for(j=0;j<2;j++) {
    if(a[i+j] != 0) break;
  }
  cout << 2-j << endl;
  for(k=0;k<2-j;k++) {
    cout << a[D-k] << " ";
  }
  cout << a[D-k] << endl;
  /*i += j;
  for(;i<D;i++) {
    cout << a[i] << " ";
  }
  cout << a[i] << endl;*/
  return 0;
}