#include<bits/stdc++.h>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");

int n, v[200005], dp[200005], pozitii[200005];

vector<int>ans;

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

    dp[1] = v[1];
    int nr_elem = 1;
    pozitii[1] = 1;


    for (int i = 2; i <= n; i++) {
        if (v[i] > dp[nr_elem]) {
            dp[++nr_elem] = v[i];
            pozitii[i] = nr_elem;
            continue;
        }

        int st = 1, dr = nr_elem, poz = 0;
        while (st <= dr) {
            int mijl = (st + dr) / 2;
            if (dp[mijl] >= v[i]) {
                dr = mijl - 1;
                poz = mijl;
            } else {
                st = mijl + 1;
            }
        }

        dp[poz] = v[i];
        pozitii[i] = poz;
    }

    fout << nr_elem << '\n';
    int curr_poz = n;
    for (int i = nr_elem; i >= 1; i--) {
        while (pozitii[curr_poz] != i)
            curr_poz--;
        ans.push_back(v[curr_poz]);
    }

    reverse(ans.begin(), ans.end());
    for (auto it:ans)
        fout << it << " ";
    return 0;
}