#include <fstream>
using namespace std;
int n,i,st,dr,mid,L,v[100010],t[100010],d[100010];
ifstream fin("scmax.in");
ofstream fout("scmax.out");
void tata(int i) {
    if (i!=0) {
        tata(t[i]);
        fout<<v[i]<<" ";
    }
}
int main() {
    fin>>n;
    for (i=1;i<=n;i++)
        fin>>v[i];
    L=1;
    d[1]=1;
    for (i=2;i<=n;i++) {
        st=1;
        dr=L;
        while (st<=dr) {
            mid=(st+dr)/2;
            if (v[d[mid]]>=v[i])
                dr=mid-1;
            else
                st=mid+1;
        }
        if (st>L) {
            L++;
            d[L]=i;
            t[i]=d[st-1];
        }
        else {
            d[st]=i;
            t[i]=d[st-1];
        }
    }
    fout<<L<<"\n";
    tata(d[L]);
    return 0;
}