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