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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int n, a[100005],v[100005],p[100005],vnr;
int cb(int st, int dr, int n)
{
int mij;
while(st<=dr)
{
mij=(st+dr)/2;
if (v[mij]<n)
st=mij+1;
else
dr=mij-1;
}
return st;
}
void citire()
{
f>>n;
for (int i = 1; i <= n; ++i)
f>>a[i];
}
void rezolvare()
{
for(int i=1;i<=n;i++)
{
int x=cb(1,vnr,a[i]);
p[i]=x;
v[p[i]]=a[i];
vnr=max(p[i],vnr);
}
}
void afisare(int nr, int poz)
{
if (nr == 0)
return;
for (int i = poz;; i--)
if (p[i] == nr)
{
afisare(nr - 1, i - 1);
g << a[i] << ' ';
return;
}
}
int main() {
citire();
rezolvare();
g<<vnr<<'\n';
afisare(vnr,n);
return 0;
}