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

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

const int maxn = 1e5 + 5;
int V[maxn], Best[maxn], Pre[maxn];
int n, maxx;

int Bin_search(int val) {
    int pos = 1;
    int l = 1;
    int r = maxx;
    while (l <= r) {
        int mid = (l + r) >> 1;
        if (V[Best[mid]] < val) {
            l = mid + 1;
            pos = l;
        } else {
            r = mid - 1;
        }
    }
    return pos;
}

void Sequence(int x) {
    if (Pre[x]) Sequence(Pre[x]);
    fout << V[x] << " ";
}

int main() {
    ios_base :: sync_with_stdio(false);
    fin >> n;
    for (int i = 1; i <= n; i++) {
        fin >> V[i];
    }
    for (int i = 1; i <= n; i++) {
        int pos = Bin_search(V[i]);
        maxx = max(maxx, pos);
        Best[pos] = i;
        Pre[i] = Best[pos - 1];
    }
    fout << maxx << "\n";
    Sequence(Best[maxx]);
    return 0;
}