#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<string> 
using namespace std;
struct water{
	int time;
	int num;
};
water a[1010];
int s;
double sum;
int main(){
	cin>>s;
	for(int q=1;q<=s;q++)
	{
		cin>>a[q].time;
		a[q].num=q;
	}
	for(int q=1;q<=s;q++)
	{
		if(a[q].time>a[q+1].time) swap(a[q],a[q+1]);
	}
	
	for(int q=1;q<=s;q++)
	{
		cout<<a[q].num<<" ";
		sum+=a[q].time;
	}
	cout<<endl;
	sum/=s;
	printf("%.2lf",sum);
	/*
	for(int q=1;q<=s;q++)
	{
		cout<<a[q].time<<" "<<a[q].num<<"  ";
	}*/
    return 0;
}