#include <bits/stdc++.h>
using namespace std;

#define pb push_back
#define mp make_pair
#define dbg(x) cout << #x <<": " << x << "\n";
using ll = long long;

const string myf = "scmax";
ifstream fin(myf + ".in");
ofstream fout(myf + ".out");


int n;
int a[100005], lis[100005], ord[100005], ind[100005];


int main() {
	int k = 0;
	fin >> n;
	for (int i = 1; i <= n; ++i)
		fin >> a[i];
	lis[++k] = a[1];
	ord[1] = 1;
	for (int i = 2; i <= n; ++i) {
		if (a[i] >= lis[k])lis[++k] = a[i], ord[i] = k;
		else {
			int poz = lower_bound(lis + 1, lis + k + 1, a[i]) - lis;
			lis[poz] = a[i];
			ord[i] = poz;
		}
	}
	fout << k << '\n';
	int j = n;
	for (int i = k; i >= 1; --i) {
		while (ord[j] != i)
			--j;
		ind[i] = j;
	}

	for (int i = 1; i <= k; ++i)
		fout << a[ind[i]] << " ";

	fin.close();
	fout.close();
	return 0;
}