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#include <bits/stdc++.h>
#define nmax 100000
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int lis[nmax+5],urm[nmax+5],a[nmax+5],n,top;
void Citire()
{
int i;
fin>>n;
for(i=1;i<=n;i++)
fin>>a[i];
fin.close();
}
int CautBin(int x,int capat)
{
int st=1,dr=capat,mij,poz=0;
while(st<=dr)
{
mij=(st+dr)/2;
if(lis[mij]>=x)
{
poz=mij;
dr=mij-1;
}
else st=mij+1;
}
return poz;
}
void Lis()
{
int i,x,maxim,j;
top=1;
lis[top]=a[1];
urm[top]=0;
for(i=2;i<=n;i++)
{
x=a[i];
if(x<lis[1])
{
lis[1]=x;
urm[i]=1;
}
else if(x>lis[top])
{
lis[++top]=x;
urm[i]=top;
}
else
{
x=CautBin(x,top);
lis[x]=a[i];
urm[i]=x;
}
}
maxim=0;
for(i=1;i<=n;i++)
maxim=max(maxim,urm[i]);
fout<<maxim<<"\n";
j=1;
for(i=1;i<=n;i++)
if(urm[i]==j)
{
fout<<a[i]<<" ";
j++;
}
}
int main()
{
Citire();
Lis();
fin.close();
fout.close();
return 0;
}