#include <fstream>

#define MAXN 100002

using namespace std;

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

int dp[MAXN], st, dr, mij, N, v[MAXN], nn, poz;

inline int Search(int val) {
    int step, ii;

    for (step = 1; step < nn; step <<= 1);
    for (ii = 0; step; step >>= 1) {
        if (step + ii <= nn && v[dp[step + ii]] < val)
            ii += step;
    }
    return ii;
}

inline void Read() {
    fin >> N;

    for (int i = 1; i <= N; i++) {
        fin >> v[i];

        poz = Search(v[i]);
        nn = max(nn, poz + 1);
        dp[poz + 1] = i;
    }

    fout << nn << "\n";

    for (int i = 1; i <= nn; i++)
        fout << v[dp[i]] << " ";
}

int main () {
    Read();

    fin.close(); fout.close(); return 0;
}