#include <bits/stdc++.h>

using namespace std;

int main() {
	freopen("scmax.in", "r", stdin);
	freopen("scmax.out", "w", stdout);
	
	int n;
	cin >> n;

	vector<int> Stack, Index, Parent(n), V(n);
	for(int i = 0; i < n; ++i) {
		cin >> V[i];
		auto pos = lower_bound(Stack.begin(), Stack.end(), V[i]) - Stack.begin();
		Parent[i] = pos == 0 ? -1 : Index[pos - 1];
		if(pos == Stack.size()) Stack.push_back(0), Index.push_back(0);
		Stack[pos] = V[i]; Index[pos] = i;
	}
	vector<int> Sol;
	for(int ind = Index.back(); ind != -1; ind = Parent[ind])
		Sol.push_back(ind);

	cout << Sol.size() << endl;
	for(auto it = Sol.rbegin(); it != Sol.rend(); ++it)
		cout << V[*it] << " ";

	return 0;
}