#include <bits/stdc++.h>
#define MAXN 100005

using namespace std;

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

int n, a[MAXN], l[MAXN], poz[MAXN];

void show(int i, int last) {
    if (i == 0)
        return;
    if (poz[i] == last - 1) {
        show(i - 1, last - 1);
        fout << a[i] << ' ';
    } else {
        show(i - 1, last);
    }
}

int main() {
    fin >> n;
    for (int i = 1; i <= n; i++)
        fin >> a[i];

    l[1] = a[1];
    poz[1] = 1;
    int k = 1;
    for (int i = 1; i <= n; i++) {
        int lo = 1, hi = k;
        while (lo <= hi) {
            int mid = lo + (hi - lo) / 2;
            if (a[i] > l[mid])
                lo = mid + 1;
            else
                hi = mid - 1;
        }

        l[lo] = a[i];
        k = max(lo, k);
        poz[i] = lo;
    }

    fout << k << '\n';
    show(n, k + 1);
    return 0;
}