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#include <fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n,v[100001],d[100001],lmax,tata[100001];
void afisare(int i)
{
if(i>0)
{
afisare(tata[i]);
fout<<v[i]<<" ";
}
}
int main()
{
fin>>n;
for(int i=1;i<=n;i++){
fin>>v[i];
d[i]=2000000001;
}
for(int i=1;i<=n;i++)
{
int st=1,dr=lmax,mid=0,poz=0;
while(st<=dr)
{
mid=(st+dr)/2;
if(v[i]>v[d[mid]])
{
st=mid+1;
poz=mid;
}
else
dr=mid-1;
}
if(poz==lmax){
lmax++;
d[lmax]=i;
tata[i]=d[poz];
}
else
{
d[poz+1]=i;
tata[i]=d[poz];
}
}
fout<<lmax<<"\n";
afisare(d[lmax]);
return 0;
}