#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n,maxx=0,v[10001],a[10001],k[10001],t[10001];

int main()
{
    int i,j,nr;
    fin>>n;
    for(i=1;i<=n;i++)
        fin>>a[i];

    for(i=1;i<=n;i++)
    {
        v[i]=1;
        nr=0;
        for(j=1;j<i;j++)
          if(a[i]>a[j] && v[i]<(v[j]+1))
                {
                    k[++nr]=a[j];
                    v[i]=v[j]+1;
                }
        k[v[i]]=a[i];
        if(v[i]>maxx)
            {
                maxx=v[i];
                for(j=1;j<=maxx;j++)
                    t[j]=k[j];
            }
    }

    fout<<maxx<<'\n';
    for(i=1;i<=maxx;i++)
       fout<<t[i]<<" ";

    return 0;
}