#include <bits/stdc++.h>
using namespace std;
ifstream in ("scmax.in");
ofstream out ("scmax.out");
int v[100001], n;
vector <int> ans;
void solve()
{
    in >> n;
    for (int i = 1;i<=n;++i)
        in >> v[i];
    for (int i = 1;i<=n;++i)
    {
        if (ans.size() == 0)
            ans.push_back(v[i]);
        else
        {
            int st = 0, dr = ans.size() - 1;
            int poz = 0, ok = 0;
            while (st <= dr && !ok)
            {
                int mid = (st + dr) / 2;
                if (ans[mid] == v[i])
                    poz = mid, ok = 1;
                else if (ans[mid] < v[i])
                    poz = mid, st = mid + 1;
                else
                    dr = mid - 1;
            }
            if (poz == ans.size() - 1 && ans[poz] < v[i])
                ans.push_back(v[i]);
            else
                ans[poz] = v[i];
        }
    }
    out << ans.size() << '\n';
    for (auto it:ans)
        out << it << ' ';
    return;
}
main ()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int t = 1;
    //cin >> t;
    while (t--)
        solve();
    return 0;
}