#include <bits/stdc++.h>
#define dim 150000
using namespace std;

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


int n;
int v[dim];
int d[dim];

void citire()
{
    fin>>n;
    for (int i=1;i<=n;i++)
        fin>>v[i];
}

void sclm()
{
    int vmax=0;
    for (int i=1;i<=n;i++)
    {
        int lmax=0;
        for (int j=1;j<=i;j++)
        {
            if (v[j]<v[i] && d[j]>d[i])
            {
                lmax=d[j];
            }
        }
        d[i]=lmax+1;
        if (d[i]>vmax) {
            vmax=d[i];
        }
    }
    fout<<vmax<<'\n';
    int rez[dim];
    int ans=0;
    for (int i=n;i>=1;i--)
    {
        if (d[i]==vmax)
        {
            rez[++ans]=v[i];
            vmax--;
        }
    }
    for (int i=ans;i>=1;i--) fout<<rez[i]<<' ';
}

int main()
{
    citire();
    sclm();
}