#include <bits/stdc++.h>

using namespace std;

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

int n, k, a[100005], dp[100005];

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

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

    dp[1] = a[1];
    k = 1;
    for (i = 2; i <= n; i++)
    {
        if (a[i] <= dp[1])
            dp[1] = a[i];
        else if (a[i] > dp[k])
            dp[++k] = a[i];
        else
        {
            p = CautBin(a[i]);
            dp[p] = a[i];
        }
    }
    fout << k << "\n";
    for (i = 1; i <= k; i++)
        fout << dp[i] << " ";


    return 0;
}