#include <bits/stdc++.h>
using namespace std;

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

int n;
const int Max = 1e5 + 1;
vector<int> a(Max), dp, ind, parent(Max);
stack<int> s;

int main()
{
    ios::sync_with_stdio(false);
    fin.tie(NULL);

    fin >> n;
    for(int i = 1; i <= n; ++i)
        fin >> a[i];

    dp.push_back(a[1]);
    ind.push_back(1);
    for(int i = 2; i <= n; ++i)
    {
        int lb = lower_bound(dp.begin(), dp.end(), a[i]) - dp.begin();
        if(a[i] > dp.back())
        {
            dp.push_back(a[i]);
            ind.push_back(i);
        }
        else
        {
            dp[lb] = a[i];
            ind[lb] = i;
        }
        if(lb > 0)
            parent[i] = ind[lb - 1];
    }
    for(int i = ind.back(); i; i = parent[i])
        s.push(i);
    fout << s.size() << "\n";
    while(!s.empty())
    {
        fout << a[s.top()] << " ";
        s.pop();
    }

    fin.close();
    fout.close();
    return 0;
}