#include <fstream>

using namespace std;

ifstream fin("subsir2.in");
ofstream fout("subsir2.out");

int a[5005], lis[5005], n;

int main()
{
    fin >> n;
    for(int i = 1; i <= n; i++)
        fin >> a[i];
    lis[n] = 1;
    int M;
    for(int i = n - 1; i > 0; i--)
    {
        M = 0;
        for(int j = i + 1; j <= n; j++)
            if(lis[j] > M && a[j] >= a[i])
                M = lis[j];
        lis[i] = 1 + M;
    }
    int p = 1;
    for(int i = 2; i <= n; i++)
        if(lis[i] > lis[p])
            p = i;
    fout << lis[p] <<"\n" << p << " ";
    int poz, ult = p, L, Min;
    for(L = lis[p] - 1; L > 0; L--)
    {
        Min = 1e9;
        for(int i = p + 1; i <= n; i++)
            if(a[i] >= a[ult] && a[i] < Min && lis[i] == L)
            {
                Min = a[i];
                poz = i;
            }
            else if(a[i] < Min && a[i] >= a[ult])
                Min = a[i];
        p = ult = poz;
        fout << p << " ";
    }
    return 0;
}