#include <fstream>
#define dim 100010
using namespace std;
int sol[dim];
int a[dim];
int d[dim];
int t[dim];
int i,n,u,k;

int main() {
    ifstream fin("scmax.in");
    ofstream fout("scmax.out");
    fin>>n;
    for (i=1;i<=n;i++) {
        fin>>a[i];
    }
    d[++u]=1;
    for (i=2;i<=n;i++) {
        int st=1;
        int dr=u;
        while (st<=dr) {///caut cel mai din dreapta element mai mic ca a[i]
            int mid=(st+dr)/2;
            if (a[d[mid]]<a[i]) {
                st=mid+1;
            }
            else {
                dr=mid-1;
            }
        }
        ///a[dr]< a[i]
        ///a[st]>=a[i]
        if (st==u+1) {
            d[++u]=i;
        }
        else {
            d[st]=i;
        }
        t[i]=d[dr];
    }
    fout<<u<<"\n";
    for (i=d[u];i!=0;i=t[i]) {
        sol[++k]=a[i];
    }
    for (i=k;i>=1;i--) {
        fout<<sol[i]<<" ";
    }
    return 0;
}