#include <fstream>
#include <vector>
using namespace std;

const int NMAX = 100000;
int n, v[NMAX+1], d[NMAX+1], pre[NMAX+1], len = 1, lenpoz = 0 ,last;
vector <int> sol;
int main()
{
    ifstream fin("scmax.in");
    ofstream fout("scmax.out");

    fin >> n;
    for (int i = 0; i < n; i++){
        fin >> v[i];
        d[i] = 1;
        pre[i] = -1;
        for (int j = 0; j < i; j++){
                if (v[j] < v[i]) {
                    d[i] = max(d[j] + 1, d[i]);
                    pre[i] = j;
                }

            }
        if (d[i] > len){
            lenpoz = i;
            len = d[i];
        }
    }
    fout << len << endl;
    last = lenpoz;
    do{
        sol.push_back(v[last]);
        last = pre[last];
        }
    while (last != -1);
    for (int i = sol.size() - 1; i >= 0; i--)
        fout << sol[i] << ' ';
    return 0;
}