#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n,he=0,a[105]; 
    cin>>n;
    for(int i=0;i<n;i++){
    	cin>>a[i];
    	he+=a[i];
    	
    }
    
    float ave = (he *1.0) / n; 
    printf("ave=%.1f\n",ave);
    for(int i=0;i<n;i++){
    	if(a[i]>ave){
    		cout<<i+1<<":"<<a[i]<<" ";
    	}
    }
    
	return 0;
}

/**************************************************************
	Problem: 1155
	User: LYY001
	Language: C++
	Result: Wrong Answer
****************************************************************/