//#include <iostream>
#include <bits/stdc++.h>
using namespace std;
ifstream in("subsir2.in");
ofstream out("subsir2.out");
const int Max=5005;
int n; int v[Max],p[Max],h[Max],l[Max],poz[Max];
int cautbin(int x,int st,int dr)
{
    int poz=-1;
    while(st<=dr)
    {
        int mij=(st+dr)/2;
        if(x>=p[mij])
            st=mij+1;
        else
        {
            poz=mij;
            dr=mij-1;
        }
    }
    return poz;
}
int main()
{
    in>>n; int nr=0;
    for(int i=1;i<=n;i++)
    {
        in>>v[i];
        int x=cautbin(v[i],1,nr);
        if(x==-1)
        {
            p[++nr]=v[i];
            l[i]=nr;

        }
        else
        {
            p[x]=v[i];
            l[i]=x;
        }
    }
    int lu=nr,k=0;
    for(int i=n;i>=1;i--)
    {
        if(l[i]==lu)
        {
            poz[++k]=i;
            lu--;
        }

    }
    out<<nr<<"\n";
    for(int i=k;i>=1;i--)
    {
        out<<poz[i]<<" ";
    }

    return 0;
}