#include <bits/stdc++.h>
#include <chrono> 
 
using namespace std;
using namespace std::chrono; 
 
// #pragma GCC target ("avx2")
// #pragma GCC optimization ("O3")
// #pragma GCC optimization ("unroll-loops")
// #pragma optimization_level 3
// #pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
 
#define f0r(a, b) for (long long a = 0; a < (b); ++a)
#define f1r(a, b, c) for (long long a = (b); a < (c); ++a)
#define f0rd(a, b) for (long long a = (b); a >= 0; --a)
#define f1rd(a, b, c) for (long long a = (b); a >= (c); --a)
#define ms(arr, v) memset(arr, v, sizeof(arr))
#define pb push_back
#define send {ios_base::sync_with_stdio(false);}
#define help {cin.tie(NULL); cout.tie(NULL);}
#define fix(prec) {cout << setprecision(prec) << fixed;}
#define mp make_pair
#define f first
#define s second
#define presum(p, a, n) {p[0] = a[0]; for (int i = 1; i < (n); i++) p[i] = a[i] + p[i-1];}
#define all(v) v.begin(), v.end()
#define getunique(v) {sort(all(v)); v.erase(unique(all(v)), v.end());}
#define readgraph(list, edges) for (int i = 0; i < edges; i++) {int a, b; cin >> a >> b; a--; b--; list[a].pb(b); list[b].pb(a);}
#define ai(a, n) for (int ele = 0; ele < n; ele++) cin >> a[ele];
#define ain(a, lb, rb) for (int ele = lb; ele <= rb; ele++) cin >> a[ele];
#define ao(a, n) {for (int ele = 0; ele < (n); ele++) { if (ele) cout << " "; cout << a[ele]; } cout << '\n';}
#define aout(a, lb, rb) {for (int ele = (lb); ele <= (rb); ele++) { if (ele > (lb)) cout << " "; cout << a[ele]; } cout << '\n';}
typedef long long ll;
typedef double ld;
typedef long double lld;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pii> vpi;
typedef vector<pll> vpl;
 
template<typename A> ostream& operator<<(ostream &cout, vector<A> const &v);
template<typename A, typename B> ostream& operator<<(ostream &cout, pair<A, B> const &p) { return cout << "(" << p.f << ", " << p.s << ")"; }
template<typename A> ostream& operator<<(ostream &cout, vector<A> const &v) {
  cout << "["; for(int i = 0; i < v.size(); i++) {if (i) cout << ", "; cout << v[i];} return cout << "]";
}
template<typename A, typename B> istream& operator>>(istream& cin, pair<A, B> &p) {
  cin >> p.first;
  return cin >> p.second;
}
 
mt19937 rng(steady_clock::now().time_since_epoch().count());
// mt19937 rng(61378913);
/* usage - just do rng() */
 
void usaco(string filename) {
  // #pragma message("be careful, freopen may be wrong")
	freopen((filename + ".in").c_str(), "r", stdin);
	freopen((filename + ".out").c_str(), "w", stdout);
}
 
const lld pi = 3.14159265358979323846;
const ll mod = 1000000007;
// const ll mod = 998244353;
// ll mod;

namespace number_theory {
	ll gcd(ll x, ll y) {
	  if (x == 0) return y;
	  if (y == 0) return x;
	  return gcd(y, x % y);
	}
	bool isprime(ll n) { 
	  if (n <= 1) return false; 
	  if (n <= 3) return true; 
	  
	  if (n % 2 == 0 || n % 3 == 0) return false; 
	  
	  for (ll i = 5; i * i <= n; i += 6) 
		if (n % i == 0 || n % (i+2) == 0) 
		  return false; 
	  
	  return true; 
	} 
	 
	bool prime[15000105]; 
	void sieve(int n) { 
	  f0r(i, n + 1) prime[i] = 1;
	  for (ll p = 2; p * p <= n; p++) { 
		if (prime[p] == true) { 
		  for (ll i = p * p; i <= n; i += p) 
			prime[i] = false; 
		} 
	  } 
	  prime[1] = prime[0] = 0;
	} 
	 
	vl primelist;
	bool __primes_generated__ = 0;
	 
	void genprimes(int n) {
	  __primes_generated__ = 1;
	  sieve(n + 1);
	  f1r(i, 2, n + 1) if (prime[i]) primelist.pb(i);
	}
	 
	vl factors(ll n) {
	  if (!__primes_generated__) {
		cerr << "Call genprimes you dope" << endl;
		exit(1);
	  }
	  vl facs;
	 
	  for (ll i = 0; primelist[i] * primelist[i] <= n && i < primelist.size(); i++) {
		if (n % primelist[i] == 0) {
		  while (n % primelist[i] == 0) {
			n /= primelist[i];
			facs.pb(primelist[i]);
		  }
		}
	  }
	  if (n > 1) {
		facs.pb(n);
	  }
	  sort(all(facs));
	  return facs;
	}
	
	vl getdivs(ll n) {
    vl divs;
    for (ll i = 1; i * i <= n; i++) {
      if (n % i == 0) {
        divs.pb(i);
        divs.pb(n / i);
      }
    }

    getunique(divs);
    return divs;
  }
}

using namespace number_theory;

ll n, m, k, q, l, r, x, y, z;
ll a[1000005];
ll b[1000005];
ll c[1000005];
string s, t;
ll ans = 0;

vl divs[200005];
vl ops;

void solve(int tc) {
  cin >> n;
  ai(a, n);
  f0r(i, n) divs[i + 1] = getdivs(i + 1);

  f1rd(i, n, 1) {
    if (a[i - 1]) {
      for (ll x: divs[i]) a[x - 1] ^= 1;
      ops.pb(i);
    }
  }

  bool f = 0;
  if (f) cout << -1 << '\n';
  else {
    reverse(all(ops));
    cout << ops.size() << '\n';
    ao(ops, ops.size());
  }
}

int main() {
  send help

  // usaco("file");

  int tc;
  tc = 1;
  // cin >> tc;
  for (int t = 0; t < tc; t++) solve(t);
} 

Measured memory_bytes: 40824