#include <fstream>

#define N 100000

using namespace std;

int v[N], q[N], s[N], solutie[N];
int n, i, j, nr, lungime;

int main() {

    ifstream f("scmax.in");
    ofstream g("scmax.out");

    f>>n;
    for (int i = 1 ;i<=n; ++i) f>>v[i];

    nr = 0;
    for (int i = 1 ; i<=n; ++i) {
        if (v[i]>s[nr]) {
            ++nr;
            s[nr] = v[i];
            q[i] = nr;
        }
        else {
            for (int j = 1; j<=nr; ++j) {
                if (s[j] >=v[i]) {
                    s[j] = v[i];
                    q[i] = j;
                    break;
                }
            }
        }
    }

    g<<nr<<"\n";
    lungime = nr;
    for (int i = n; i>=1; --i) {
        if (q[i] == nr) {
            solutie[nr] = v[i];
            --nr;
        }
    }

    for (int i = 1; i<=lungime ; ++i) {
        g<<solutie[i]<<" ";
    }
}