#include <vector>
#include <fstream>
#include <iostream>

#define max(a, b) (a) > (b) ? (a) : (b)

using namespace std;

vector<int> subsir(int* v, int n)
{
	int* sir;
    int current;

	sir = new int[n];

	for (int i = 0; i < n; i++)
	{
		sir[i] = 1;

		for (int k = i - 1; k >= 0; k--)
			if (v[k] < v[i] && sir[i] < sir[k] + 1)
				sir[i] = sir[k] + 1;

        current = max(sir[i], current);
	}

	vector<int> ret;

	for (int i = n - 1; i >= 0 && current >= 1; i--)
		if (sir[i] == current)
        {
			ret.insert(ret.begin(), v[i]);
            current--;
        }

	delete [] sir;
	return ret;
}

int main(int argc, char* argv[])
{
	ifstream file("scmax.in", ifstream::in);
    int n;
    int *v;

    file >> n;
    v = new int[n];

    for (int i = 0; i < n; i++)
        file >> v[i];

    file.close();

    ofstream out("scmax.out", ofstream::out);
    vector<int> sir = subsir(v, n);

    out << (int) sir.size() << endl;
	for (vector<int>::iterator it = sir.begin(); it != sir.end(); it++)
		out << *(it) << " ";

    out.flush();
    out.close();
	return 0;
}