#include<fstream.h>

int v[100000];
int main()
{ifstream f("scmax.in");
ofstream h("scmax.out");
int n,i,j,max=0,ii,z[100000];
long long a[100000];
f>>n;
for(i=1;i<=n;i++)
f>>a[i];
v[n]=1;
for(i=n-1;i>=1;i=i-1)
{   for(j=i;j<=n;j++)
if(v[i]<v[j]+1&&a[i]<a[j])
{v[i]=v[j]+1;
z[i]=j;}
if(v[i]==0)
v[i]=1;
if(max<v[i])
{max=v[i];
ii=i;}}
h<<max<<"\n";
h<<a[ii]<<" ";
for(i=1;i<max;i++)
{h<<a[z[ii]]<<" ";
ii=z[ii];}
return 0;}