#include <fstream>
#define dim 100010
using namespace std;
int a[dim];
int d[dim];
int t[dim];
int sol[dim];
int i,n,u,k,ult;
int 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]=1;
    for (i=2;i<=n;i++) {
        st=1;
        dr=u;
        while (st<=dr) {///caut ultimul element mai mic sau ca a[i]
            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) {
            d[++u]=i;
            t[i]=d[dr];
            ult=i;
        }
        else {
            d[st]=i;
            t[i]=d[dr];
        }
    }
    //fout<<u;
    i=ult;
    while (i!=0) {
        sol[++k]=i;
        i=t[i];
    }
    fout<<u<<"\n";
    for (i=k;i>=1;i--) {
        fout<<a[sol[i]]<<" ";
    }
    return 0;
}