#include <iostream>
#include <fstream>
#include <algorithm>
#include <stack>
#include <limits.h>

using namespace std;

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

int v[100003];
int t[100003];
int f[100003];
int p[100003];
int k;
int n;

void afis(int i) {
    if(p[i] != 0)
        afis(p[i]);
    out << v[i] << " ";
}

int main() {
    in >> n;
    int mx = 0;
    int poz;
    for(int i = 1; i <= n; i++) {
        in >> v[i];
        poz = upper_bound(t+1, t+k+1, v[i])-t;
        if(t[poz-1] == v[i])
            poz--;
        if(poz > k) {
            mx = i;
            k++;
        }
        p[i] = f[poz-1];
        f[poz] = i;
        t[poz] = v[i];
    }
    out << k << '\n';
    afis(mx);
    return 0;
}