#! /usr/bin/env python3
n = int(input())

nums = [int(i)-1 for i in input().split()]
largest = [-1, -1]
smallest = [1, -1]
for i in range(n):
    nums[i] -= i
    if nums[i] > largest[0]:
        largest[0] = nums[i]
        largest[1] = i
    if nums[i] < smallest[0]:
        smallest[0] = nums[i]
        smallest[1] = i
if largest[1] != smallest[1]:
    print (largest[1]+1, smallest[1]+1)
else:
    print ("Cool Array")