#include <cstdio>
#include <vector>
#include <algorithm>
#include <stack>
using namespace std;
/*
ifstream fin("scmax.in");
ofstream fout("scmax.out");*/
FILE* fin=fopen("scmax.in","r");
FILE* fout=fopen("scmax.out","w");

const int NMAX=100010;

int n,poz[NMAX];
vector<pair<int,int> >v;
int initial[NMAX];
int sol[NMAX];
int aib[NMAX];
int ind[NMAX];
int pre[NMAX];
int stiva[NMAX];
struct comparator{
    bool operator()(pair<int,int> a, pair<int,int> b){
        if (a.first==b.first)
            return a.second<b.second;
        return a.first<b.first;
    }
};
void citire()
{
    fscanf(fin,"%d",&n);
    v.push_back(pair<int,int>(0,0));
    pair<int,int> cont;
    for (int i=1; i<=n; i++){
        fscanf(fin,"%d",&cont.first);
        cont.second=i;
        v.push_back(cont);
    }
}
void salvare()
{
    for (int i=1; i<=n; i++)
        initial[i]=v[i].first;
}
void stabilirePozitii()
{
    for (int i=1; i<=n; i++){
        poz[v[i].second]=i;
        int j=i+1;
        while (j<=n){
            if (v[i].first==v[j].first){
                poz[v[j].second]=i;
                j++;
            }else{
                break;
            }
        }
        i=j-1;
    }
}
pair<int,int> query(int j)
{
    int maxim=0, pozMx=-1;
    while (j>0){
        if (aib[j]>maxim){
            maxim=aib[j];
            pozMx=ind[j];
        }
        j-=(j&(~(j-1)));
    }
    return pair<int,int>(maxim,pozMx);
}
void update(int i,int val,int indice)
{
    while (i<=n){
        if (val>aib[i]){
            aib[i]=val;
            ind[i]=indice;
        }
        i+=(i&(~(i-1)));
    }
}
void rezolvare()
{
    pair<int,int> rezultat;
    for (int i=1; i<=n; i++){
        rezultat=query(poz[i]-1);
        sol[i]=rezultat.first+1;
        pre[i]=rezultat.second;
        update(poz[i],sol[i],i);
    }
}
void afisareRecursiv(int i)
{
    if (i!=-1){
        afisareRecursiv(pre[i]);
        fprintf(fout,"%d",initial[i]);
        fprintf(fout,"%c",' ');
    }
}
void afisare()
{
    int mx=0,pozMx=-1;
    for (int i=1; i<=n; i++){
        if (sol[i]>mx){
            mx=sol[i];
            pozMx=i;
        }
    }
    fprintf(fout,"%d",mx);
    fprintf(fout,"%c",'\n');
    while (pozMx!=-1){
        stiva[0]++;
        stiva[stiva[0]]=pozMx;
        pozMx=pre[pozMx];
    }
    for (int i=stiva[0]; i>=1; i--){
        fprintf(fout,"%d %c",initial[stiva[i]],' ');
    }
}
int main()
{
    citire();
    salvare();
    sort(v.begin()+1,v.end(),comparator());
    stabilirePozitii();
    rezolvare();
    afisare();
}