#include<cstdio>
#define NMAX 5000+5
#define oo (1<<30)
using namespace std;
int N,Vmin,Amin,p;
int V[NMAX],A[NMAX],T[NMAX];
void write(int x)
{
    printf("%d ",x);
    if(x==T[x]) return;
    write(T[x]);
}
int main()
{
    int i,j;
    freopen("subsir2.in","r",stdin);
    freopen("subsir2.out","w",stdout);
    scanf("%d",&N);
    for(i=1; i<=N; i++) scanf("%d",&V[i]);
    for(i=N; i>=1; i--)
    {
        Vmin=Amin=oo;
        for(j=i+1; j<=N; j++)
            if(V[j]>=V[i] && V[j]<Vmin)
            {
                Vmin=V[j];
                if(A[j]<=Amin)
                {
                    Amin=A[j];
                    p=j;
                }
            }
        if(Vmin==oo)
        {
            A[i]=1;
            T[i]=i;
        }
        else
        {
            A[i]=Amin+1;
            T[i]=p;
        }
    }
    Amin=A[1];
    p=1;
    Vmin=V[1];
    for(i=2; i<=N; i++)
        if(V[i]<Vmin)
        {
            Vmin=V[i];
            if(A[i]<=Amin)
            {
                Amin=A[i];
                p=i;
            }
        }
    printf("%d\n",Amin);
    write(p);
    /* min1=sol[1], p=1, j=v[1];
    for(i=2;i<=n;++i)
        if(v[i]<j)
        {   j=v[i];
            if(sol[i]<=min1) min1=sol[i], p=i;
        }
    g<<min1<<"\n"<<p<<" ";
    min1--;
    while(min1) {min1--; p=bf[p]; g<<p<<" ";}*/
    return 0;
}