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#include <fstream>
#define NMAX 100001
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n, v[NMAX], best[NMAX], p[NMAX], l[NMAX], nr, k, poz;
void afisare(int i)
{
if(p[i]>0)
{
afisare(p[i]);
}
fout<<v[i]<<" ";
}
int caut(int x)
{
int st, dr, mid;
st=0;
dr=nr;
mid=(st+dr)/2;
if(v[l[mid]]<x && v[l[mid+1]]>=x)
{
return mid;
}
else if(v[l[mid+1]]<x)
{
st=mid+1;
mid=(st+dr)/2;
}
else
{
dr=mid-1;
mid=(st+dr)/2;
}
return nr;
}
int main()
{
fin>>n;
for(int i=1; i<=n; i++)
{
fin>>v[i];
caut(v[i]);
}
nr=1;
best[1]=l[1]=1;
l[0]=0;
for(int 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;
}
}
int maxim=0;
poz=0;
for(int i=1;i<=n; i++)
{
if(maxim<best[i])
{
maxim=best[i];
poz=i;
}
}
fout<<maxim<<"\n";
afisare(poz);
return 0;
}