n=int(input())
l1=list(map(int,input().split()))
s=0
for i in range(0,n):
    s+=l1[i]
a=s / n
print('AVE={:.1f}'.format(a))
for i in range(0,n):
    if l1[i] > a:
         print('{}:{}'.format(i + 1,l1[i]),end=' ')
print()


/**************************************************************
	Problem: 1155
	User: admin
	Language: Python
	Result: Accepted
	Time:95 ms
	Memory:34480 kb
****************************************************************/