#include <iostream>
#include <fstream>

using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");

int main()
{
    int D[100001],A[100001],k,n;
    f>>n;
    for(int i=1;i<=n;i++)
        f>>A[i];
    k = 1, D[k] = A[1];
    for(int i = 2 ; i <= n ; i ++)
    {
        if(A[i] > D[k])
            D[++k] = A[i];
        else
        {
            int st = 1, dr = k, poz = k + 1;
            while(st <= dr)
            {
                int m = (st + dr) / 2;
                if(D[m] > A[i])
                    poz = m, dr = m - 1;
                else
                    st = m + 1;
            }
            D[poz] = A[i];
        }
    }
    g<<k<<'\n';
    for(int i=1;i<=k;i++)
        g<<D[i]<<' ';
    return 0;
}