#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 caut_binar(int val) {
    st = 1; dr = nn;

    while (st <= dr) {
        mij = (st + dr) / 2;

        if (v[dp[mij]] > val) {
            dr = mij - 1;
        }
        else
            st = mij + 1;
    }
    return dr;
}

inline void Read() {
    fin >> n; fin >> v[1]; dp[1] = 1; nn = 1;

    for (int i = 2; i <= n; i++) {
        fin >> v[i];

        poz = caut_binar(v[i]);
        if (poz == nn) {
            if (v[dp[nn]] < v[i])
            dp[++nn] = i;
        }
        else if (v[dp[poz + 1]] > v[i])
            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;
}