#include <bits/stdc++.h>

using namespace std;

ifstream in("cmlsc.in");
ofstream out("cmlsc.out");

int check(std::vector<int>& dp, std::vector<int>& v, int Max, int x) {
    int l = 1, r = Max;
    int ans = 0;
    while (l <= r) {
        int m = (l + r) / 2;
        if (v[dp[m]] < x) {
            ans = max(ans, m);
            l = m + 1;
        } else {
            r = m - 1;
        }
    }

    return ans;
}

void print(std::vector<int>& prev, std::vector<int>& v, int pos) {
    if (pos == -1) {
        return;
    }

    print(prev, v, prev[pos]);
    out << v[pos] << " ";
}

int main() {
    int n;
    in >> n;

    std::vector<int> v(n, 0);
    for (int i = 0; i < n; i++)
        in >> v[i];

    std::vector<int> dp(n + 1, -1);
    std::vector<int> prev(n + 1, -1);
    dp[1] = 0;
    int Max = 1;
    int pmax = 0;

    for (int i = 1; i < n; i++) {
        int pos = check(dp, v, Max, v[i]);
        dp[pos + 1] = i;
        prev[i] = dp[pos];
        if (pos + 1 > Max) {
            Max = pos + 1;
            pmax = i;
        }
    }

    out << Max << '\n';

    print(prev, v, pmax);
}