int main(){
int n,i,a[101],b[4]={0};
double c[4]={0};
scanf("%d",&n);
for(i=0;i<n;i++){
scanf("%d",&a[i]);
}
for(i=0;i<n;i++){
	if(a[i]>=1&&a[i]<=18){
	b[0]+=1;
	}
if(a[i]>=19&&a[i]<=35){
	b[1]+=1;
	}
if(a[i]>=36&&a[i]<=60){
	b[2]+=1;
	}
if(a[i]>60){
	b[3]+=1;
	}
}
for(i=0;i<4;i++){
 c[i]=(b[i]*1.0*100)/n;
}
printf("1-18: %.2lf%%\n",c[0]);
printf("19-35: %.2lf%%\n",c[1]);
printf("36-60: %.2lf%%\n",c[2]);
printf("60??: %.2lf%%\n",c[3]);
return 0;
}
