#include <fstream>
using namespace std;

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

int v[100005], n, pre[100005], lungime[100005], best;

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

void solve() {
    for(int i = 1; i <= n; i++) {
        int st = 1, dr = best;
        while(st <= dr) {
            int m = (st+dr)/2;
            if(v[lungime[m]] < v[i]) st = m+1;
            else dr = m-1;
        }
        best = max(st, best);
        lungime[st] = i;
        pre[i] = lungime[st-1];
    }

    fout << best << '\n';
}

void afis(int a) {
    if(!a) return;
    afis(pre[a]);
    fout << v[a] << ' ';
}

int main() {
    citire();
    solve();
    afis(lungime[best]);
}