#include <vector>
#include <fstream>
 
using namespace std;
 
ifstream fin("scmax.in");
ofstream fout("scmax.out");
 
template <typename T>void print (T const& coll){ for (typename T::const_iterator pos=coll.begin() ,end(coll.end()); pos!=end; ++pos) fout << *pos << ' ';   fout <<'\n';}
vector<int> getLis(const vector<int> &a) {
    vector<int> b;
    vector<int> p(a.size());
    if(a.empty()) return b;
    b.push_back(0);
    int u , v , mid;
    for(size_t i = 1;i < a.size();++i) {
         
        if(a[i] > a[b.back()]) {
            p[i] = b.back();
            b.push_back(i);
            continue;
        }
 
        for(u = 0 , v = b.size() - 1;u < v;) {
            mid = u + ((v - u)>>1);
            if(a[b[mid]] < a[i]) u = mid + 1; else v = mid;
        }
 
        if(a[i] < a[b[u]]) {
            b[u] = i;
            if(u > 0) p[i] = b[u - 1];
        }
    }
    for(u = b.size() , v = b.back();u--;v = p[v]) b[u] = a[v];
    return b;
}
 
int main()
{
    int N;
    fin>>N;
    vector<int> v(N) , ans;
    for(int i = 0;i < N;i++) {
        fin>>v[i];
    }
    ans = getLis(v);
    fout<<ans.size()<<'\n';
    print(ans);
    return 0;
}