#include <fstream>
#define dim 100010
using namespace std;
int a[dim];
int d[dim];
int sol[dim];
int i,j,n,u,st,dr,mid;

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