#include<iostream>
using namespace std;
int a,b[11],c=0;
double d=0;
int main(){
cin>>a;
for(int i=1;i<=a;i++){
cin>>b[i];
if(b[i]>=c){
c=b[i];
}
d+=b[i];
}
cout<<"AV=";
printf("%.1f\n",d*1.0/a);
for(int i=1;i<=a;i++){
if(b[i]>d/a){
cout<<i<<":"<<b[i]<<" ";
}
}
return 0;
}
