#include <bits/stdc++.h>
using namespace std;

int main () {
    ifstream fin ("scmax.in");
    ofstream fout ("scmax.out");
    ios::sync_with_stdio(false);

    vector <int> v;
    int n, x;
    for (fin >> n; n; n--) {
        fin >> x;
        auto it = upper_bound(v.begin(), v.end(), x-1);
        if (it==v.end())
            v.push_back(x);
        else
            *it=x;
    }

    fout << v.size() << '\n';
    for (auto it: v)
        fout << it << ' ';
    return 0;
}