#include <bits/stdc++.h>
using namespace std;
int n;
pair<pair<int, int>, int> a[100100];
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cin >> n;
  for (int i = 1; i <= n; i++) {
    int x;
    cin >> x;
    a[i].first.first = x;
  }
  for (int i = 1; i <= n; i++) {
    int x;
    cin >> x;
    a[i].first.second = x;
    a[i].second = i;
  }
  sort(a + 1, a + n + 1);
  reverse(a + 1, a + n + 1);
  cout << (n / 2) + 1 << endl;
  cout << a[1].second << " ";
  for (int i = 2; i <= n; i += 2) {
    if (i == n)
      cout << a[i].second;
    else {
      int x = a[i].second;
      if (a[i + 1].first.second > a[i].first.second) x = a[i + 1].second;
      cout << x << " ";
    }
  }
  return 0;
}
