int main()
{
	int n;
	scanf("%d",&n);
	int sz[100];
	int i;
	for(i=0;i<n;i++)
	{
		scanf("%d",&(sz[i]));
	}
	int j;
	double k,p,q,m,s,a,b,c,d;
	a=b=c=d=0;
	
	k=p=q=m=s=0;
	for(j=0;j<n;j++)
	{
		if(sz[j]<=18){
			k+=1.0;
		}
		else if(sz[j]>=19&&sz[j]<=35){
			p+=1.0;
		}
		else if(sz[j]>=36&&sz[j]<=60){
			q+=1.0;
		}
		else if(sz[j]>=61){
			m+=1.0;
		}


	}
	s=p+q+m+k;
	a=k/s*100;
    b=p/s*100;
	c=q/s*100;
	d=m/s*100;

	printf("1-18: %.2lf%%\n",a);
	printf("19-35: %.2lf%%\n",b);
	printf("36-60: %.2lf%%\n",c);
	printf("60??: %.2lf%%\n",d);


	return 0;
}

  