#include <fstream>
#include <algorithm>
using namespace std;ifstream f("scmax.in");ofstream g("scmax.out");int v[100005],p[100005],q[100005];int i,j,n,mx,x;void afisare (int fx, int fp){while(p[fp]!=fx)fp--;if(fx>1)afisare(fx-1, fp-1);g<<v[fp]<<" ";}int main(){f>>n;for (i=1;i<=n;i++){f>>v[i];x=v[i];j=1;while(x>q[j] && j<=mx) j++;q[j]=x;p[i]=j;mx=max(mx, j);}g<<mx<<"\n";afisare(mx, n);}