#include<stdio.h>
int main(){
	int n,i;
	scanf("%d",&n); 
	int a[n];
	double s=0,avg=0;
	for(i=0;i<n;i++){
		scanf("%d",&a[i]);
		s = s + a[i];
	}
	avg = s/n; 
	printf("AVE=%.1lf\n",avg);
	for(i=0;i<n;i++){
		if(a[i]>avg){
		printf("%d:%d ",i+1,a[i]); 
		}
	} 
	return 0;
}

/**************************************************************
	Problem: 1155
	User: admin
	Language: C
	Result: Accepted
	Time:9 ms
	Memory:1144 kb
****************************************************************/