#include <fstream>
using namespace std;

const int N = 1e5;
int n, x[N + 1], lung[N + 1], pmax;

ifstream in("scmax.in");
ofstream out("scmax.out");

void refac_subsir(int p, int l, int val)
{
    if (l == 0)
    {
        return;
    }
    if (lung[p]==l && x[p]<val)
    {
        refac_subsir(p-1,l-1,x[p]);
        out << x[p] << " ";
    }
    else
    {
        refac_subsir(p-1,l,val);
    }
}

int main()
{
    int n;
    in>>n;
    int pmax=1;
    for(int i=1;i<=n;i++)
    {
        int l_j=0;
        in>>x[i];
        for(int j=1;j<i;j++)
        {
            if(x[j]<x[i])
            {
                if(lung[j]>l_j)
                {
                    l_j=lung[j];
                }
            }
        }
        lung[i]=1+l_j;
        if(lung[i]>lung[pmax])
        {
            pmax=i;
        }
    }
    out<<lung[pmax]<<"\n";
    refac_subsir(pmax, lung[pmax], x[pmax]+1);
    in.close();
    out.close();
    return 0;
}