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