#include <bits/stdc++.h>
#include <fstream>
using namespace std;
ifstream in("scmax.in");
ofstream out("scmax.out");

int GetCeilIndex(int arr[], vector<int> &T, int l, int r,
				int key)
{
	while (r - l > 1)
	{
		int m = l + (r - l)/2;
		if (arr[T[m]] >= key)
			r = m;
		else
			l = m;
	}

	return r;
}

void lis(int arr[], int n)
{

	vector<int> tailIndices(n, 0); // Initialized with 0
	vector<int> prevIndices(n, -1); // initialized with -1
    vector<int> res;
	int len = 1;
	for (int i = 1; i < n; i++)
	{
		if (arr[i] < arr[tailIndices[0]])

			tailIndices[0] = i;

		else if (arr[i] > arr[tailIndices[len-1]])
		{

			prevIndices[i] = tailIndices[len-1];
			tailIndices[len++] = i;
		}
		else
		{

			int pos = GetCeilIndex(arr, tailIndices, -1,
								len-1, arr[i]);

			prevIndices[i] = tailIndices[pos-1];
			tailIndices[pos] = i;
		}
	}

	out << len<<"\n";
	for (int i = tailIndices[len-1], j = len;j>0;  i = prevIndices[i],j--)
        res.push_back(arr[i]);
    for(auto it = res.rbegin(); it!=res.rend() ;it++)
        out<<*it<<" ";

}

int main()
{
    int *arr;;
	int n ;
    in >> n;
    arr = new int[n+10];
    for(int i = 0 ; i < n ; i++)
        in>>arr[i];
	lis(arr, n);

	return 0;
}