#include <fstream>

using namespace std;

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

const int DIM = 100010;

int n, k;
int v[DIM], dp[DIM], f[DIM];

int getPos(int num) {
    int left = 1, right = k;
    while (left <= right) {
        int middle = (left + right) / 2;
        if (v[dp[middle]] < num)
            left = middle + 1;
        else
            right = middle - 1;
    }
    return left;
}

void getSol(int index) {
    if (index > 0) {
        getSol(f[index]);
        fout << v[index] << ' ';
    }
}

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

    for (int i = 1; i <= n; i++) {
        if (v[i] > v[dp[k]]) {
            dp[++k] = i;
            f[i] = dp[k - 1];
        } else {
            int position = getPos(v[i]);
            dp[position] = i;
            f[i] = dp[position - 1];
        }
    }

    fout << k << '\n';
    getSol(dp[k]);

    return 0;
}