#include <fstream>
#include <climits>
using namespace std;
ifstream f("subsir2.in");
ofstream g("subsir2.out");
int n,i,v[5001],l[5001],ok,k,maxim,elem,minim,copie,j;
int main()
{
    f>>n;
    for(i=1;i<=n;i++)
        f>>v[i];
    l[n]=1;
    for(i=n-1;i>=1;i--)
    {
         minim=INT_MAX;
         maxim=INT_MIN;
        for(j=i+1;j<=n;j++)
        if(v[i]<v[j]&&v[j]<minim&&l[j]>maxim){minim=v[j];maxim=l[j];}

        l[i]=maxim+1;
    }
   maxim=INT_MAX;



   maxim=l[1];


    g<<maxim<<'\n';

    elem=INT_MIN;
    int poz=0;

    while(maxim)
    {

    minim=INT_MAX;

    for(i=1;i<=n;i++)
    if(l[i]==maxim&&v[i]>elem){if(v[i]<minim){poz=i;minim=v[i];copie=i;}}

    g<<copie<<" ";
    elem=v[copie];
    maxim--;


    }


    return 0;
}