#include <bits/stdc++.h>

using namespace std;

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

int n, k;
long long lis[100005];

void LIS(int x)
{
    if(x == lis[k])
        return;

    if(x > lis[k])
    {
        lis[++k] = x;
        return;
    }

    if(x < lis[1])
    {
        lis[1] = x;
        return;
    }

    int st = 1, dr = n, mij, poz = -1;

    while(st <= dr)
    {
        mij = (st + dr) / 2;

        if(lis[mij] > x)
        {
            poz = mij;
            dr = mij - 1;
        }
        else st = mij + 1;
    }

    lis[poz] = x;
}

void Citire()
{
    int x;

    fin >> n;
    for(int i = 1; i <= n; i++)
        fin >> x,
        LIS(x);
}

int main()
{
    Citire();

    fout << k << "\n";
    for(int i = 1; i <= k; i++)
        fout << lis[i] << " ";

    return 0;
}