#include <iostream>
#include <fstream>
using namespace std;
int a[100000],n,b[100000],o=0,i,j;
int main()
{
    ifstream fin("scmax.in");
    ofstream fout("scmax.out");
    fin>>n;
    for(i=1;i<=n;i++)fin>>a[i];
    b[n]=1;
    for(i=n-1;i>=1;i--)
    {
        for(j=i;j<=n;j++)if((a[i]<a[j])&&(b[i]<=b[j]))b[i]=b[j]+1;
    }
    //for(i=1;i<=n;i++)cout<<b[i];
    //cout<<endl;
    for(i=1;i<=n;i++)if(b[i]>o)o=b[i];
    fout<<o<<endl;
    for(i=1;i<=n;i++)
    {
        if(b[i]==o){fout<<a[i]<<" ";o--;}
    }
    fin.close();
    fout.close();
    return 0;
}