#include <fstream>

using namespace std;

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

const int N = 1000001;

int n, d[N], v[N];

void rec(int i) {
    if (d[i] == 0) return;
    int j;
    for (j = i - 1; j >= 0; j--) {
        if (d[i] - 1 == d[j]) {
            rec(j);
            j = -1;
        }
    }
    rec(j);
    out << v[i] << ' ';
}

int main()
{
    int r = 0;
    in >> n;
    for (int i = 1; i <= n; i++) {
        in >> v[i];
        for (int j = i; j >= 0; j--) {
            if (v[j] < v[i]) r = max(r, d[j]);
        }
        d[i] = 1 + r;
    }
    out << d[n] << '\n';

    int poz = 0;
    r = 0;
    for (int i = 1; i <= n; i++) {
        if (d[i] > r) {
            r = d[i];
            poz = i;
        }
    }
    rec(poz);
}