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

int main() {
    int n;
    fin >> n;
    int x;
    fin >> x;
    vector<int> dp = {x};
    for (int i = 1; i < n; i++) {
        fin >> x;
        auto it = lower_bound(dp.begin(), dp.end(), x);
        if (it == dp.end()) {
            dp.push_back(x);
        } else {
            *it = x;
        }
    }
    fout << dp.size() << '\n';
    for (int it : dp) {
        fout << it << ' ';
    }
    fout << endl;
    fout.close();
    return 0;
}