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#include <fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n,i,j,a[100001],b[100001],c[100001],poz,x;
int main()
{
fin>>n;
for(i=1;i<=n;i++)
fin>>a[i];
b[1]=a[1];
b[0]=1;
for(i=2;i<=n;i++)
{
for(j=1;j<=b[0];j<<=1);
for(poz=0;j;j>>=1)
{
if(poz+j<=b[0]&&b[poz+j]<a[i])
poz+=j;
}
if(poz==b[0])b[0]++;
b[poz+1]=a[i];
c[i]=poz+1;
}
fout<<b[0]<<'\n';
x=1;
for(i=1;i<=n&&x<=b[0];i++)
{
if(c[i]==x)
{
fout<<a[i]<<" ";
x++;
}
}
return 0;
}