#include <fstream>

using namespace std;

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

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

int main()
{
    int M;
    fin >> n;
    for(int i = 1; i <= n; i++)
        fin >> a[i];
    lis[n] = 1;
    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[p] < lis[i]) p = i;
        else if(lis[p] == lis[i] && a[i] < a[p])
            p = i;
    fout << lis[p] <<" \n" << p <<" ";
    int L = lis[p] - 1;
    int poz = p;
    while(L > 0)
    {
        M = 1e7 + 1;
        for(int i = p + 1; i <= n; i++)
            if(lis[i] == L && a[i] < M && a[i] > a[poz])
            {
                p = i;
                M = a[i];
            }
        L--;
        poz = p;
        fout << p <<" ";
    }
    return 0;
}