#include <iostream>
#include<fstream>
#include<vector>;
using namespace std;
#define nmax 5000

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

int n,sir[nmax],lis[nmax];

int main()
{int i,j;
f>>n;
for(i=1;i<=n;i++)
    f>>sir[i];
lis[1]=1;
int maxim=0;
for(i=2;i<=n;i++)
{
for(j=1;j<i;j++)
    if(sir[j]<sir[i] && lis[i]<lis[j]+1)
{
    lis[i]=lis[j]+1;
    if(maxim<lis[i])
        maxim=lis[i];
}

}
g<<maxim<<endl;
vector<int>v;
for(i=n;i>=1;i--)
    if(maxim)
{
    if(lis[i]==maxim)
    {
        v.push_back(i);
        maxim--;
    }
}

   for(i=v.size()-1;i>=0;i--)
    g<<v[i]<<" ";
    return 0;
}