Closest Palindrome Number

Write a function that returns the closest palindrome number to an integer. If two palindrome numbers tie in absolute distance, return the smaller number.

Examples

closest_palindrome(887) ➞ 888

closest_palindrome(100) ➞ 99
# 99 and 101 are equally distant, so we return the smaller palindrome.

closest_palindrome(888) ➞ 888

closest_palindrome(27) ➞ 22

Notes

If the number itself is a palindrome, return that number.