class PeopleFilterByAge
{

 public static int oldFilter(Person [] a,int n,Date d)
 {
  int count=0;
  for(int i=0;i<n;i++)
     if(a[i].older(d))
        a[count++]=a[i];
  return count;
 }

 public static int youngFilter(Person [] a,int n,Date d)
 {
  int count=0;
  for(int i=0;i<n;i++)
     if(!a[i].older(d))
        a[count++]=a[i];
  return count;
 }

}