//#include <iostream>
#include <vector>
#include <algorithm>
#include <fstream>

using namespace std;

typedef unsigned long long ull;

ifstream cin("scmax.in");
ofstream cout("scmax.out");

int find_ind(vector<int>& elems, int val) {
    int st = 0;
    int dr = elems.size() - 1;
    int ind = 0;

    while (st <= dr) {
        int mid = (st + dr) / 2;
        if (elems[mid] < val) {
            ind = mid;
            st = mid + 1;
        }
        else {
            dr = dr - 1;
        }
    }
    if (ind == dr) ind++;
    return ind;
}

int main()
{
    int n;
    cin >> n;
    vector<int> v(n);
    for (int i = 0; i < n; i++) {
        cin >> v[i];
    }

    vector<int> elems;
    elems.push_back(v[0]);
    for (int i = 1; i < n; i++) {
        int ind = find_ind(elems, v[i]);
        if (ind < elems.size()) {
            elems[ind] = v[i];
        }
        else {
            elems.push_back(v[i]);
        }
    }
    cout << elems.size() << '\n';
    for (auto& it : elems) {
        cout << it << ' ';
    }
    return 0;
}