#include<bits/stdc++.h>
using namespace std;
int n,a[70];
double ans;
int main(){
    cin>>n;
    for(int i=1;i<=n;i++){
    	cin>>a[i];
    	ans+=a[i];
	}
	ans/=n;
	cout<<"ANS=";
	printf("%.1f",ans);
	cout<<endl;
	for(int i=1;i<=n;i++){
    	if(a[i]>ans){
    		cout<<i<<":"<<a[i]<<" ";
		}
	}
    return 0;
}
/**************************************************************
	Problem: 1155
	User: chenjingqi
	Language: C++
	Result: Wrong Answer
****************************************************************/