#define MAX_N 100000

#include <fstream>
using namespace std;

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

struct Nod
{
    int val;
    Nod* t;
};

int n, l, PD[MAX_N + 1];
Nod* P[MAX_N + 1];

void Cb(int x);
void Afisare(Nod* N);

int main()
{
    fin >> n;
    for (int i = 1, x; i <= n; ++i)
    {
        fin >> x;
        Cb(x);
    }

    fout << l << '\n';
    Afisare(P[l]);

    fin.close();
    fout.close();
    return 0;
}

void Cb(int x)
{
    if (PD[l] == x) { return; }

    if (PD[l] < x)
    {
        PD[++l]   = x;
        P[l]      = new Nod();
        P[l]->val = x;
        P[l]->t   = P[l - 1];
        return;
    }

    int st = 1, dr = l, mij, res;
    while (st <= dr)
    {
        mij = (st + dr) / 2;
        if (PD[mij] >= x)
        {
            res = mij;
            dr = mij - 1;
        }
        else
        {
            st = mij + 1;
        }
    }

    P[res]      = new Nod();
    P[res]->val = x;
    P[res]->t   = P[res - 1];
    PD[res]     = x;
}

void Afisare(Nod* N)
{
    if (N == nullptr) { return; }

    Afisare(N->t);
    fout << N->val << ' ';
}