int main(){
	int n;
	scanf("%d",&n);
    int bingren[100];	
	double nianling[4];

	int i;
	for(i=0;i<n;i++)
	{
		scanf("%d",&bingren[i]);
	}
	for(i=0;i<4;i++)
	{
		nianling[i]=0.0;
	}
	for(i=0;i<n;i++)
	{
		if(bingren[i]<=18)
		{
			nianling[0]++;
		}
		if(bingren[i]>18&&bingren[i]<=35)
		{
			nianling[1]++;
		}
		if(bingren[i]>35&&bingren[i]<=60)
		{
			nianling[2]++;
		}
		if(bingren[i]>=61)
		{
			nianling[3]++;
		}
	}
	for(i=0;i<4;i++)
	{
		nianling[i]=nianling[i]*100/n;
	}
	printf("1-18: %.2lf%%\n",nianling[0]);
	printf("19-35: %.2lf%%\n",nianling[1]);
	printf("36-60: %.2lf%%\n",nianling[2]);
	printf("60??: %.2lf%%\n",nianling[3]);
	return 0;
}
