//subsir crescator maximal
#include<fstream>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");

#define Nmax 100005
int n,a[Nmax],L,ante[Nmax],Tata[Nmax];

void init()
{
    f>>n;
    for(int i=1;i<=n;i++) f>>a[i];
}

void SCMAX()
{
    ante[1]=1; L=1;
    for(int i=2;i<=n;i++)
    {
        int st=1,dr=L;
        while(st<=dr)
        {
            int mij=(st+dr)/2;
            if(a[i]>a[ante[mij]]) st=mij+1;
                             else dr=mij-1;
        }
        if(st>L) L++;
        ante[st]=i; Tata[i]=ante[st-1];
    }
}
void afisare(int x)
{
    if(x!=0)
    {
        afisare(Tata[x]);//afisare de tata lui x
        g<<a[x]<<" ";
    }
}

int main ()
{
    init();
    SCMAX();
    g<<L<<'\n';
    afisare(ante[L]);
    return 0;
}