#include <fstream>
#define In "subsir2.in"
#define Out "subsir2.out"
#define Nmax 5002
#define val_max 1000100
using namespace std;
int Lis[Nmax+2],next[Nmax+2],a[Nmax+2];
int n,start,L;
///Lis[i] = lungimea minima a subsirului crescator maximal care incepe cu a[i]
bool viz[Nmax+2];
ofstream g(Out);
inline void Citire()
{
    ifstream f(In);
    f>>n;
    for(int i=1;i<=n;i++)
        f>>a[i];
    f.close();
}
inline void Dinamic()
{
    int i,j,minm;
    Lis[n] = 1;
    for(i = n-1; i ;i--)
    {
        Lis[i]  = Nmax;
        minm = val_max;
        for(j=i+1;j<=n;j++)
        {
            if(a[i]<=a[j]&& a[j]<minm)
            {
                viz[j] = true;
                minm = a[j];
                if(Lis[i]>Lis[j]+1)
                {
                    Lis[i] = Lis[j]+1;
                    next[i] = j;
                }
                else
                    if(Lis[i]==Lis[j]+1&&a[next[i]]>a[j])
                        next[i] = j;
            }
        }
        if(Lis[i]==Nmax)
            Lis[i] = 1;
    }
}
inline void Afisare()
{
    int i;
    L = Nmax;
    for(i=1;i<=n;i++)
        if(viz[i]==false)
        {
            if(Lis[i]<L)
            {
                L = Lis[i];
                start = i;
            }
            else
                if(Lis[i] ==L &&a[start]>a[i])
                    start = i;
        }
    g<<L<<"\n";
    while(start)
    {
        g<<start<<" ";
        start = next[start];
    }
    g<<"\n";
    g.close();
}
int main()
{
    Citire();
    Dinamic();
    Afisare();
    return 0;
}