#include <fstream>
#define Nmax 100000
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int a[Nmax+5], sol[Nmax+5];
int best[Nmax+5], poz[Nmax+5];
int N,lg;
void Citire();
void Rezolva();
void Reconstituire();
void Afisare();
int CautBin(int x);
int main()
{
Citire();
Rezolva();
Reconstituire();
Afisare();
return 0;
}
void Citire()
{
fin>>N;
int i;
for(i=1;i<=N;i++)
fin>>a[i];
}
void Rezolva()
{
int i, loc;
for(i=1;i<=N;i++)
{
if(a[i]>best[lg])
{
best[++lg]=a[i];
poz[i]=lg;
}
else
{
loc=CautBin(a[i]);
best[loc]=a[i];
poz[i]=loc;
}
}
}
int CautBin(int x)
{
int st, dr, mij;
st=0; dr=lg+1;
while(dr-st>1)
{
mij=(st+dr)/2;
if(best[mij]>=x)
dr=mij;
else
st=mij;
}
return dr;
}
void Reconstituire()
{
int i,k, val;
k=0; val=lg;
for(i=N;i>0 && val!=0; i--)
{
if(poz[i]==val)
{
sol[++k] = a[i];
val--;
}
}
}
void Afisare()
{
fout<<lg<<'\n';
int i;
for(i=lg;i>0;i--)
fout<<sol[i]<<" ";
fout<<'\n';
}