#include <fstream>
using namespace std;
ifstream cin("scmax.in");
ofstream cout("scmax.out");

#define nmax 100010

int n,v[nmax],poz[nmax],pred[nmax],s[nmax],k,t,l,p,u,mij;
int st,dr;

int main()
{
    int i,j;
    cin>>n;
    for (i=1;i<=n;i++)
        cin>>v[i];
    poz[1]=1;
    l=1;
    for (i=2;i<=n;i++)
    {
        st=1; //p
        dr=l; // u
        while (st<=dr)
        {
            mij=(st+dr)/2;
            if (v[i]<=v[poz[mij]])
                dr=mij-1;
            else
                st=mij+1;
        }
        pred[i]=poz[st-1];
        poz[st]=i;
        if (st>l)
            l=st;
    }
    k=poz[l];
    for (i=l;i;i--)
    {
        s[i]=v[k];
        k=pred[k];
    }
    cout<<l<<'\n';
    for (i=1;i<=l;i++)
        cout<<s[i]<<" ";
}