#include <iostream>
#include <fstream>
#include <algorithm>
#include <vector>
#include <stack>
using namespace std;

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

int sequence[100005];
stack <int> rasp;
int n, lmax;
int v[100005];
int parent[100005];


int caut_bin(int elem)
{
    int st = 0, dr = lmax, m;
    while (st < dr)
    m = (st + dr) >> 1, (v[sequence[m]] < elem) ? st = m + 1 : dr = m;
    return st;
}


int main()
{
    fin >> n;
    int i = 0, ex;
    while(fin >> v[i++]);
    int pos;
    sequence[0] = 0;
    for (i = 1; i < n; i++)
    {
        if (v[i] < v[sequence[0]])
        {
            sequence[0] = i;
        }
        else if (v[i] > v[sequence[lmax]])
        {
            parent[i] = sequence[lmax];
            lmax++;
            sequence[lmax] = i;
        }
        else
        {
            pos = caut_bin(v[i]);
            if (v[i] != v[sequence[pos]])
            {
                parent[i] = sequence[pos - 1];
                sequence[pos] = i;
            }
        }
    }
    fout << lmax + 1 << endl;
    //cout << sequence[0] << " " << sequence[1] << " " << sequence[2] << endl;

    //cout << endl;
    //cout << lmax << endl;
    //lmax--;
    //cout << sequence[lmax] << endl;
    rasp.push(v[sequence[lmax]]);
   // lmax--;
    while (lmax > 0)
        {
            i = parent[sequence[lmax]];
            rasp.push(v[i]);
            lmax--;
        }
    while (!rasp.empty())
    {
        fout << rasp.top() << " ";
        rasp.pop();
    }

    return 0;
}
/*#include <iostream>
#include <fstream>
#include <algorithm>
#include <vector>
#include <stack>
using namespace std;

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

vector <int> sequence;
stack <int> rasp;
int n, lmax;
int v[100005];
int parent[100005];


int caut_bin(int elem)
{
    int st = 0, dr = sequence.size() - 1, m;
    while (st < dr)
    m = (st + dr) >> 1,(sequence[m] < elem) ? st = ++m : dr = m;
    return st;
}


int main()
{
    fin >> n;
    int i = 0, ex;
    while(fin >> v[i++]);
    int pos;
    sequence.push_back(0);
    lmax = 1;
    for (i = 1; i < n; i++)
    {
        ex = sequence.back();
        if (v[i] < v[sequence[0]])
        {
            sequence[0] = i;
        }
        else if (v[i] > v[ex])
        {
            //cout << " ba " << v[i] << endl;
            //parent[i] = parent[ex];
            parent[i] = sequence[lmax - 1];
            sequence.push_back(i);
            lmax++;
        }
        else
        {
            pos = caut_bin(v[i]);
           // if(v[pos] != v[i])
             parent[i] = sequence[pos - 1];
             sequence[pos] = i;
            //else
            //{
             //   while (sequence[pos] == v[i])
              //  {
               //     pos++;
                //}
                //sequence[pos] = i;
                //parent[i] = sequence[pos - 1];
                //parent[i] = parent[pos] + 1;
            //}
            //cout << v[i] << " pus pe " << pos << " si " << v[sequence[pos - 1]] << " cu " << v[sequence[pos]] << endl;
        }
    }
    //fout << sequence.size();
    fout << lmax << endl;
    //rasp.push(sequence.back() + 1);
    //cout << sequence.size() << " " << sequence.back();
    rasp.push(v[sequence.back()]);
    lmax--;
    while (lmax > 0)
        {
            i = parent[sequence.back()];
            //rasp.push(i + 1);
            rasp.push(v[i]);
            sequence.pop_back();
            lmax--;
        }
    while (!rasp.empty())
    {
        fout << rasp.top() << " ";
        rasp.pop();
    }
 //  for (i = 0 ; i < sequence.size(); i++)
  //  {

        //cout << v[sequence[i]] << " ";
   // }

    return 0;
}
*/
/*#include <bits/stdc++.h>
using namespace std;

const int max_n = 100000;
int n;
vector<int> v(max_n);
vector<int> before(max_n);
vector<int> tail(max_n);
vector<int> solution(max_n);
int length, last_position;

int find_best_j(int value) {

    int l = -1;

    int r = length;

    int m;

    while (l + 1 < r) {

        m = l + (r - l) / 2;



        if (v[tail[m]] < value) {

            l = m;

        } else {

            r = m;

        }

    }

    return r;

}

int main() {

    freopen("sclm.in", "r", stdin);

    freopen("sclm.out", "w", stdout);



    cin >> n;

    for (int i = 0; i < n; i++) {

        cin >> v[i];

        tail[i] = 0;

        before[i] = -1;

    }



    for (int i = 1; i < n; i++) {

        if (v[i] < v[tail[0]]) {

            tail[0] = i;

        } else if (v[i] > v[tail[length]]) {

            tail[++length] = i;

            before[i] = tail[length - 1];

            last_position = i;

        } else {

            int pos = find_best_j(v[i]);

            tail[pos] = i;

            before[i] = tail[pos - 1];

        }

    }

    cout << length + 1 << "\n";

    int solution_length = length + 1;

    while (before[last_position] != -1)
    {
        solution[length--] = v[last_position];
        last_position = before[last_position];

    }
    solution[0] = v[last_position];

    for (int i = 0; i < solution_length; i++)
    {
        cout << solution[i] << " ";
    }

    cout << "\n";

    return 0;

}
*/