#include<fstream>
#include<iostream>
using namespace std;
#define MAX 100001
ifstream f("scmax.in");
ofstream g("scmax.out");
int a[MAX],b[MAX],poz[MAX];
int n,m;

int caut(int p, int u, int x)
{int m;
while(p<=u)
    {m=(p+u)>>1;
     if(x<a[b[m]]) p=m+1;
              else u=m-1;}
return p;}

void subsir()
{int i,j,k;
a[0]=1234567890;
for(i=n;i>=1;i--)
                {k=caut(1,m,a[i]);
                 poz[i]=b[k-1];
                 if(k>m) {m=k;
                          b[k]=i;}
                    else if(a[b[k]]<a[i]) b[k]=i;
                 }

}
int main()
{int i;
f>>n;
for (i=1;i<=n;i++) f>>a[i];
subsir();

g<<m<<'\n';
for(i=b[m];i>0;i=poz[i]) g<<a[i]<<' ';

return 0;
}