int main()
{
  int n,i;
  double a,b,c,d;
  a=0;
  b=0;
  c=0;
  d=0;
  scanf("%d",&n);
  int haha[1000];
  for (i=0;i<n;i++)
  {
	  scanf("%d",&haha[i]);
  }
  for (i=0;i<n;i++)
  {
      if(haha[i]>0&&haha[i]<19)
		  a=a+1;
	  else if (haha[i]>18&&haha[i]<36)
		  b=b+1;
	  else if (haha[i]>35&&haha[i]<61)
		  c=c+1;
      else if (haha[i]>60)
          d=d+1;
  }
  
  a=a/n;
  b=b/n;
  c=c/n;
  d=d/n;
  printf("1-18: %.2lf%%\n",a*100);
  printf("19-35: %.2lf%%\n",b*100);
  printf("36-60: %.2lf%%\n",c*100);
  printf("60??: %.2lf%%",d*100);

	return 0;
}
