#include <iostream>
#include <fstream>
using namespace std;
ifstream in ("scmax.in");
ofstream out ("scmax.out");
int v[100002],l[100002],pred[100002],maxx,a[100002],ind;
void sir (int c)
{
    if (pred[c] != 0)
    {
        sir (pred[c]);
    }
    out << v[c] << " ";
}
int main()
{
    int n,c;
    in>>n;
    for (int i=1; i<=n; i++)
    {
        in>>v[i];
    }
    for (int i=1; i<=n; i++)
    {
        for (int j=1; j<i; j++)
            if (v[j]<v[i])
            {
                if (l[j]>l[i])
                {
                    l[i]=l[j];
                    pred[i]=j;
                }
            }
        l[i]++;
        if (l[i]>maxx)
        {
            maxx=l[i];
            c=i;
        }
    }
    out<<maxx<<'\n';
    sir (c);
    return 0;
}