#include<fstream>
using namespace std;
ifstream f ("scmax.in");
ofstream g ("scmax.out");
int n, v[100001] , sol[100001] , ns , a[100001];
void citire ()
{
    f >> n;
    for (int i = 1; i <=n; ++i)
        f >> v[i];
}
void afis (int k)
{
    for (int i = 1; i <= k; ++i)
    {
        sol[i] = a[i];
        ns = k;
    }
}
bool verif (int k)
{
    if (v[a[k]] <= v[a[k-1]] )
        return 0;
    return 1;
}
int BKT (int k)
{
    if (k-1 > ns) afis(k-1);
    for (int i = a[k] - 1 + 1; i <= n; ++i)
    {
        a[k] = i; if (verif (k)) BKT(k + 1);
    }
}
int main ()
{
    citire();
    BKT(1); g << ns << '\n';
    for (int i = 1; i <=ns; ++i)
        g << v[sol[i]] << ' ';
    g.close ();
    return 0;
}