#include <iostream>
#include <fstream>

using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");

int v[100001];

int sir[100001];
int L[100001];


int main (){
    int n;
    fin >> n;
    for (int i = 1; i<=n; i++){
        fin >> v[i];
    }

    int nr = 1;

    sir[1] = v[1];

    L[1] = 1;
    int maxi = 1;

    int index_max = 1;

    vector<int> sol;


    for (int i = 2; i <= n; i++)
    {
        int st = 1;
        int dr = nr;
        int rez = 0;
    
        while (st <= dr)
        {
            int mid = (st + dr) / 2;
            if(sir[mid] < v[i])
            {
                rez = mid;
                st = mid + 1;
            }
            else{
                dr = mid - 1;
            }
        }
        if(rez == nr){
            nr++;
        }

        sir[rez + 1] = v[i];
        L[i] = rez + 1;

        if(L[i] > maxi){
            maxi = L[i];
            index_max = i;
        }
    }

    fout << maxi << "\n";

    for (int i = index_max; i > 0; i--){
        if(L[i] == maxi){
            sol.push_back(v[i]);
            maxi--;
        }
    }

    reverse(sol.begin(), sol.end());

    for (auto i: sol){
        fout << i << " ";
    }
}