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

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

int n, a[100005];
int dp[100005], poz[100005], m;
int sol[100005];

int CautBin(int x)
{
    int st, dr, p, mij;
    if (x > dp[m])
    {
        m++;
        return m;
    }
    if (x <= dp[1]) return 1;
    st = 1; dr = m; p = 0;
    while (st <= dr)
    {
        mij = (st + dr) / 2;
        if (x <= dp[mij])
        {
            p = mij;
            dr = mij - 1;
        }
        else st = mij + 1;
    }
    return p;
}

int main()
{
    int i, j, p, M;
    fin >> n;
    for (i = 1; i <= n; i++)
        fin >> a[i];
    m = 1;
    dp[1] = a[1];
    poz[1] = 1; ///poz[i] = 1; HOW?!?
    for (i = 2; i <= n; i++)
    {
        p = CautBin(a[i]);
        dp[p] = a[i];
        poz[i] = p;
    }
    fout << m << "\n";
    M = m;
    for (i = n; i >= 1 && m > 0; i--)
        if (poz[i] == m)
        {
            sol[m] = a[i];
            m--;
        }
    for (i = 1; i <= M; i++)
        fout << sol[i] << " ";
    fout << "\n";
    return 0;
}