#include<iostream>
#include<algorithm>
#include<iomanip>
using namespace std;
int main(){
	double a,b=0;
	int A=0,B=0,C=0,D=0,E=0,most=0,c=0,arr[200];
	cin>>a;
	for(int i=0;i<a;i++){
		cin>>arr[i];
		b+=arr[i];
		if(c<arr[i]){
			c=arr[i];
			most=i+1;
		}
		if(arr[i]>=90 and arr[i]<=100){
			A+=1;
		}
		else if(arr[i]<=89 and arr[i]>=80){
			B+=1;
		}
		else if(arr[i]<=79 and arr[i]>=70){
			C+=1;
		}
		else if(arr[i]<=69 and arr[i]>=60){
			D+=1;
		}
		else{
			E+=1;
		}
	}
	cout<<fixed<<setprecision(2)<<b/a<<endl;
	cout<<most<<endl;
	cout<<"A:";
	for(int i=0;i<A;i++)
		cout<<"*";
	cout<<endl;
	cout<<"B:";
	for(int i=0;i<B;i++)
		cout<<"*";
	cout<<endl;
	cout<<"C:";
	for(int i=0;i<C;i++)
		cout<<"*";
	cout<<endl;
	cout<<"D:";
	for(int i=0;i<D;i++)
		cout<<"*";
	cout<<endl;
	cout<<"E:";
	for(int i=0;i<E;i++)
		cout<<"*";
	cout<<endl;
	return 0;
}