#include <fstream>
using namespace std;
ifstream f("subsir2.in");
ofstream g("subsir2.out");
int n,i,j,mi,k,mx,nr,s[5010],l[5010],v[5010];
int main()
{
    f >> n;
    for(i = 1; i <= n; ++i)
        f >> v[i];
    for(i = n - 1; i >= 1; --i)
    {
        mi = 40000000;
        l[i] = 40000000;
        for(j = i + 1; j <= n; ++j)
        {
            if(v[j] < mi && v[i] <= v[j])
            {
                mi = v[j];
                nr = l[j] + 1;
                if(l[i] == nr &&v[j] < v[s[i]])
                    s[i] = j;
                if(nr < l[i])
                {
                    l[i] = nr;
                    s[i] = j;
                }
            }
        }
        if(l[i] == 40000000)
        {
            s[i] = i;
            l[i] = 1;
        }
    }
    mx = 0;
    for(i = 1; i <= n; ++i)
        if(l[i] > mx)
        {
            mx = l[i];
            k = i;
        }
    ++mx;
    g << mx << '\n';
    while(mx > 0)
    {
        --mx;
        g << k << " ";
        k = s[k];
    }
    g << '\n';
    return 0;
}