#include <bits/stdc++.h>
using namespace std;
const int N = 100 + 10;
long long n;
pair<long long, int> a[N];
mt19937 rnd(time(0));
bool check()
{
    long long sum = 0;
    for (int i = 1; i <= n and sum < 1e9; i++)
        sum += a[i].first;
    return sum == 1e9;
}
void solve()
{
    cin >> n;
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i].first;
        a[i].second = i;
    }

    while (!check())
        shuffle(a + 1, a + 1 + n, rnd);
    long long sum = 0;
    vector<int> ans;
    for (int i = 1; i <= n and sum <1e9; i++)
    {
        ans.push_back(a[i].second);
        sum += a[i].first;
    }
    cout << ans.size() << " ";
    for (int ai : ans)
        cout << ai << " ";
}
signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int t = 1;
    // cin >> t;
    while (t--)
    {
        solve();
    }
}