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#include <fstream>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
const int NMAX=100005;
int a[NMAX],v[NMAX],poz[NMAX],n,b[NMAX];
int dim;
inline void Read()
{
f>>n;
for(int i=1;i<=n;i++)
f>>a[i];
}
inline int Cb(int x)
{
int st=1,dr=dim,m,ret;
while(st<=dr)
{
m=(st+dr)/2;
if(v[m]<x)
st=m+1;
else
{
ret=m;
dr=m-1;
}
}
return ret;
}
inline void Solve()
{
v[1]=a[1];
poz[1]=1;
dim=1;
for(int i=2;i<=n;i++)
{
if(v[dim]<a[i])
{
v[++dim]=a[i];
poz[i]=dim;
}
else
{
int ps=Cb(a[i]);
v[ps]=a[i];
poz[i]=ps;
}
}
g<<dim<<"\n";
}
inline void Rec()
{
int nb=dim;
for(int i=n;i>=1;i--)
{
if(poz[i]==nb)
{
b[nb]=a[i];
nb--;
}
}
for(int i=1;i<=dim;i++)
g<<b[i]<<" ";
}
int main()
{
Read();
Solve();
Rec();
return 0;
}