#include <iostream>
#include <fstream>

using namespace std;

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

int a[100001], top[100005], pre[100005], afis[100005];

int main() {
    int n, k = 1;
    fin >> n;
    for (int i = 1; i <= n; i++)
        fin >> a[i];
    top[1] = 1;
    for (int i = 2; i <= n; i++) {
        int st = 1, dr = k;
        if (a[i] > a[top[dr]]) {
            pre[i] = top[dr];
            top[++k] = i;
        }
        else {
            int sol = 1;
            while (st <= dr) {
                int m = (st + dr) / 2;
                if (a[i] <= a[top[m]]) {
                    sol = m;
                    dr = m - 1;
                }
                else
                    st = m + 1;
            }
            top[sol] = i;
            pre[i] = top[sol - 1];
        }
    }
    fout << k << "\n";
    int nr = 0;
    for (int i = top[k]; i != 0; i = pre[i])
        afis[++nr] = a[i];
    for (int i = nr; i >= 1; i--)
        fout << afis[i] << " ";
    return 0;
}