#include <fstream>

using namespace std;

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

int s[100005], v[100005], n, maxim;

int main() {
    fin >> n;
    for(int i = 1; i <= n; i++) {
        fin >> v[i];
    }
    fin.close();
    for(int i = 1; i <= n; i++) {
        int st = 1, dr = maxim;
        while(st <= dr) {
            int m = (st + dr) / 2;
            if(v[s[m]] < v[i]) {
                st = m + 1;
            } else if(v[s[m]] >= v[i]) {
                dr = m - 1;
            }
        }
        s[st] = i;
        if(st > maxim) {
            maxim = st;
        }
    }
    fout << maxim << "\n";
    for(int i = 1; i <= maxim; i++) {
        fout << v[s[i]] << " ";
    }
    fout.close();
    return 0;
}