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#include<fstream>
#include<iostream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int a[100001],l[100001],poz[100001],n,m,prim;
void citire()
{
int i;
fin>>n;
for(i=1; i<=n; i++)
fin>>a[i];
}
void subsir()
{
int i,j;
for(i=n; i>=1; i--){
l[i]=1;
poz[i]=0;
for(j=i+1; j<=n; j++)
if(a[i]<a[j] && l[i]<1+l[j])
{
l[i]=1+l[j];
poz[i]=j;
}
if(m<l[i])
{
m=l[i];
prim=i;
}
}
}
void
tipar()
{
int i;
fout<<m<<endl;
for(i=prim; i>0; i=poz[i])
fout<<a[i]<<' ';
}
int main()
{
citire();
subsir();
tipar();
fin.close();
return 0;
}