#include <fstream>
#include <algorithm>
#include <vector>
using namespace std;

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

int n, numbers[100005];
vector<int> s;

int main()
{
    fin >> n;
    for (int i = 1; i <= n; i++)
        fin >> numbers[i];
    // Folosim functia lower_bound
    for (int i = 1; i <= n; i++)
    {
        vector<int>::iterator it = lower_bound(s.begin(), s.end(), numbers[i]);
        if (it == s.end())
            s.push_back(numbers[i]);
        else
            *it = numbers[i];
    }
    fout << s.size() << "\n";
    int ansStack[100005], top = 0;
    for (int i = n; i >= 1; i--)
    {
        vector<int>::iterator it = lower_bound(s.begin(), s.end(), numbers[i]);
        if (it != s.end() && *it == numbers[i])
        {
            ansStack[++top] = numbers[i];
            s.erase(it);
        }
    }
    while (top)
        fout << ansStack[top--] << " ";
    fout << "\n";
    return 0;
}