int main()
{
	int n,sz[100],i;
	char j=0;
	double a=0.0,b=0.0,c=0.0,d=0.0;
	scanf("%d",&n);
	for(i=0;i<n;i++)
	{
		scanf("%d",&sz[i]);
		if(sz[i]<=18)
		{
			a++;
		}
		else
		{
			if(sz[i]<=35)
			{
				b++;
			}
			else
			{
				if(sz[i]<=60)
				{
					c++;
				}
				else
				{
					d++;
				}
			}
		}
	}
	printf("1-18:%c%.2lf%%\n",32,a*100/n);
		printf("19-35:%c%.2lf%%\n",32,b*100/n);
			printf("36-60:%c%.2lf%%\n",32,c*100/n);
				printf("60??:%c%.2lf%%\n",32,d*100/n);
				return 0;
}