#include <bits/stdc++.h>

using namespace std;

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

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

int Cautbin(int x)
{
    int st, dr, mij, poz;
    st = 1;
    dr = k;
    while(st <= dr)
    {
        mij = (st + dr) / 2;
        if(lis[mij] >= x)
        {
            poz = mij;
            dr = mij - 1;
        }
        else
            st = mij + 1;
    }
    return poz;
}
int main()
{
    int i, sol = 0, j, poz;
    k = 1;
    fin >> n;
    for(i = 1;i <= n;i++)
        fin >> a[i];
    lis[1] = a[1];
    for(i = 2;i <= n;i++)
    {
        if(lis[1] > a[i])
            lis[1] = a[i];
        else if(lis[k] < a[i])
            lis[++k] = a[i];
        else
        {
            int x = a[i];
            lis[Cautbin(x)] = x;
        }
    }
    fout << k << "\n";
    for(i = 1;i <= k;i++)
        fout << lis[i] << " ";
    return 0;
}