#include <bits/stdc++.h>
#define cin ci
#define cout co
using namespace std;

ifstream cin("scmax.in");
ofstream cout("scmax.out");

const int inf = 1e9;
int n;
vector<int> v, dp, par;

int bs(int left, int right, int val)
{
    int ans = 0;
    while (left <= right)
    {
        int mij = (left + right) / 2;
        if (v[dp[mij]] < val)
        {
            left = mij + 1;
        }
        else
            right = mij - 1;
    }
    return left;
}

int main()
{
    cin >> n;
    v.resize(n + 5);
    dp.assign(n + 5, 0);
    par.resize(n + 5);

    for (int i = 1; i <= n; i++)
        cin >> v[i];

    v[0] = -inf;
    dp[0] = 0;
    int len = 0;

    for (int i = 1; i <= n; i++)
    {
        if (v[dp[len]] < v[i])
        {
            dp[++len] = i;
            par[i] = dp[len - 1];
        }
        else
        {
            int pos = bs(1, len, v[i]);
            dp[pos] = i;
            par[i] = dp[pos - 1];
        }
    }

    cout << len << '\n';
    int cur = dp[len];
    vector<int> ans;
    while(cur != 0)
    {
        ans.push_back(v[cur]);
        cur = par[cur];
    }
    reverse(ans.begin(), ans.end());
    for(auto i : ans)
        cout << i << " ";
    return 0;
}