#include <stdio.h>  
#include <fstream>

using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n, v[100003], best[100003], p[100003], maxim, k, L[100003], nr;
void afis(int i)
{
	if (p[i] > 0)  afis(p[i]);
	fout << v[i] << " ";;
}
int caut(int x)
{
	int p, u, m;
	p = 0; u = nr; m = (p+u)/2;
	while (p <= u)
{
if (v[L[m]] < x &&  v[L[m+1]] >= x) return m;
else if (v[L[m+1]] < x) {p = m + 1; m = (p + u)/2;}
else {u = m - 1; m = (p + u)/2;}
}
return nr;
}
int main()
{

int i, j, poz;
nr = 1;
fin >> n;
for (i = 1; i <= n; i++) fin >> v[i];
best[1] = L[1] = 1; L[0] =  0;
for (i = 2; i <= n; i++)
{
poz = caut(v[i]);
p[i] = L[poz];
best[i] = poz + 1;
L[poz + 1] = i;
if (nr < poz + 1)   nr = poz + 1;
}
maxim = 0; poz = 0;
for (i = 1; i <= n; i++)
if (maxim < best[i])
{
maxim = best[i]; poz = i;
}
fout << maxim << endl;
afis(poz);
return 0;  
}