#include <bits/stdc++.h>
using namespace std;
#define int long long
#define re return
#define ew 5005
#define sz 10000005
#define sscc cout<<6;
const int MOD=1e9+7;
struct node{
	int time;
	int id;
}a[sz];	
bool cmp(node x,node y){
	return x.time<y.time;
}
int sum;
signed main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	int n;
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i].time;
		a[i].id=i;
	}
	sort(a+1,a+n+1,cmp);
	for(int i=1;i<=n;i++){
		cout<<a[i].id<<" ";
		for(int j=1;j<i;j++){
			sum+=a[j].time;
		}
	}
	cout<<endl;
	double ans=sum/n;
	printf("%.2lf",ans);
	re 0;
}