int main(){
int n;
int i;
double x=0,y=0,z=0,w=0;
int a[100];
scanf("%d",&n);
for(i=0;i<100;i++){
scanf("%d",&(a[i]));
 }
for(i=0;i<n;i++){
if(a[i]<=18){
x++;}
else if(a[i]<36){
y++;}
else if(a[i]<61){
z++;}
else if(a[i]>=60){
w++;}
  }
printf("1-18: %.2lf%%\n",100.0*x/n);
printf("19-35: %.2lf%%\n",100.0*y/n);
printf("36-60: %.2lf%%\n",100.0*z/n);
printf("60??: %.2lf%%\n",100.0*w/n);
return 0;
}
