#include <bits/stdc++.h>

using namespace std;

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

int n, a[100005];
vector <int> sir;

int main()
{
    fin >> n;
    for (int i = 1; i <= n; i++)
        fin >> a[i];
    for (int i = 1; i <= n; i++)
    {
        if (sir.empty())
            sir.push_back(a[i]);
        else
        {
            if (a[i] >= sir.back())
                sir.push_back(a[i]);
            else
            {
                int pos = upper_bound(sir.begin(), sir.end(), a[i]) - sir.begin();
                sir[pos] = a[i];
            }
        }

    }
    fout << sir.size() << "\n";
    for (int i = 0; i < sir.size(); i++)
        fout << sir[i] << " ";
    return 0;
}