#include <bits/stdc++.h>

void read_input(int &n, std::vector<int> &vec)
{
    std::ifstream fin("scmax.in");

    fin >> n;
    vec.resize(n);

    for (int i = 0; i < n; ++i)
        fin >> vec[i];

    fin.close();
}

void print_output(int &len, std::vector<int> &seq)
{
    std::ofstream fout("scmax.out");

    fout << len << '\n';

    for (auto &nr : seq)
        fout << nr << ' ';
    fout << '\n';

    fout.close();
}

int main()
{
    int n;
    int len = 0;
    std::vector<int> v;
    std::vector<int> dp;
    std::vector<int> seq;

    read_input(n, v);

    dp.resize(n, 0);

    for (int index, i = 0; i < n; ++i) {
        index = i;

        for (int j = i - 1; j >= 0; --j)
            if (v[j] < v[i] && dp[j] > dp[index])
                index = j;

        dp[i] = dp[index] + 1;

        len = std::max(len, dp[i]);
    }

    for (int l = len, i = n - 1; i >= 0; --i) {
        if (dp[i] == l) {
            seq.insert(seq.begin(), v[i]);
            --l;
        }
    }

    print_output(len, seq);

    return 0;
}