#include <bits/stdc++.h>

using namespace std;

ofstream fout("scmax.out");

int n, k;
int a[100005], lis[100005], poz[100005];
int sol[100005];

void Read()
{
    int i;
    ifstream fin("scmax.in");
    fin >> n;
    for(i = 1; i <= n; i++)
        fin >> a[i];
    fin.close();
}

int Bin(int x)
{
    int st, dr, m, p;
    st = 1;
    dr = k;
    while(st <= dr)
    {
        m = (st + dr) / 2;
        if(lis[m] < x)
            st = m + 1;
        else
        {
            p = m;
            dr = m - 1;
        }
    }
    return p;
}

void Solve()
{
    int i, x, p;
    lis[1] = a[1];
    poz[1] = 1;
    k = 1;
    for(i = 2; i <= n; i++)
    {
        x = a[i];
        if(lis[k] < x)
        {
            lis[++k] = x;
            poz[i] = k;
        }
        else
        {
            p = Bin(x);
            lis[p] = x;
            poz[i] = p;
        }
    }
    fout << k << "\n";
    p = k;
    for(i = n; i >= 1 && k > 0; i--)
        if(poz[i] == k)
        {
            sol[k] = a[i];
            k--;
        }
    for(i = 1; i <= p; i++)
        fout << sol[i] << " ";
    fout.close();
}

int main()
{
    Read();
    Solve();
    return 0;
}