#include <fstream>

#define MAXN 100005

using namespace std;

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

int dp[MAXN], dad[MAXN], N, v[MAXN], nn;

inline int binarySearch(int val) {
    int step, ii;
    for (step = 1; step <= nn; step <<= 1);

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

inline void Afis(int nr) {
    if (nr) {
        Afis(dad[nr]);
        fout << v[nr] << " ";
    }
}

inline void Read() {
    int poz;

    fin >> N;

    for (int i = 1; i <= N; i++) {
        fin >> v[i];
        poz = binarySearch(v[i]);
        nn = max(nn, poz + 1);
        dad[i] = dp[poz];
        dp[poz + 1] = i;
    }

    fout << nn << "\n";

    Afis(dp[nn]);
}

int main () {
    Read();

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