#include <bits/stdc++.h>
using namespace std;
int main()
{
double zong = 0, quan[100000] , shen , a;
cin >> a;
for (int i = 0 ; i <= a - 1 ; i++)
{
cin >> shen;
zong+=shen;
quan[i] = shen;
}
cout << "AV=";
printf("%.1f" , zong / a);
cout << endl;
for (int i = 0 ; i <= a - 1 ; i++)
{
if (quan[i] > zong / a){
cout << i + 1 << ":" << quan[i] << " ";
}
}
}
