#include <fstream>
#include <vector>
#include <algorithm>

using namespace std;

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

vector <int> v;
vector <pair<int,int>> dp;

int maxi, p;

void afis(int p)
{
	if (dp[p].second >= 0) {
		fout << v[p]<<" ";
		afis(dp[p].second);
	}
	else fout << v[p];
}

void scmax()
{
	dp.resize(v.size());

	dp[0].first = 1;
	dp[0].second = -1;

	for (int i = 1; i < v.size(); i++) {
		dp[i].first = 1;
		dp[i].second = -1;
		for (int j = 0; j < i; j++) {
			if (v[j] < v[i]) {
				if (dp[j].first + 1 > dp[i].first) {
					dp[i].first = dp[j].first + 1;
					dp[i].second = j;
				}
			}
		}
	}

	int maxi = 0, p;
	for (int i = 0; i < dp.size(); i++) {
		if (dp[i].first > maxi) {
			maxi = dp[i].first;
			p = i;
		}
	}

	fout << maxi << endl;
	afis(p);
	

}


int main()
{
	int n, x;
	fin >> n;
	for (int i = 0; i < n; i++) {
		fin >> x;
		v.push_back(x);
	}

	scmax();

	fin.close();
	fout.close();
}