#include <fstream>
#include <iostream>
#define INF 1000010

using namespace std;

ifstream f("subsir2.in");
ofstream g("subsir2.out");

int n, v[5005], best[5005], poz[5005], p, sol, minn[5005];

void Solve()
{
    // I < J MEREU
    best[n] = 1;
    poz[n] = -1;
    for(int i = n - 1; i >= 1; --i)
    {
        best[i] = 1;
        poz[i] = -1;
        for(int j = i + 1; j <= n; ++j)
        {
            if(v[i] <= v[j] && best[i] < best[j] + 1)
            {
                best[i] = best[j] + 1;
                poz[i] = j;
                if(best[i] > sol)
                {
                    sol = best[i];
                    p = i;
                }
                minn[i]  = v[j];
            }
            else if(v[i] <= v[j] && best[i] == best[j] + 1)
            {
                if( v[j] < minn[i])
                {
                    minn[i] = v[j];
                    poz[i] = j;
                }
            }
        }
    }
}

void Show()
{
    g << sol << '\n';
    while(p != -1)
    {
        g << p << ' ';
        p = poz[ p ];
    }
}

int main()
{
    f >> n;
    for(int i = 1; i <= n; ++i)
        f >> v[i];
    Solve();
    Show();
}