Is It a Palindrome?

A palindrome reads the same forwards and backwards, like racecar or level.

Write a function is_palindrome(s) that returns True if the string s is a palindrome and False otherwise. Ignore the difference between upper- and lower-case letters, so Level counts as a palindrome. Do not worry about spaces or punctuation; the inputs only contain letters.

Examples

Input:  s = "racecar"
Output: True

Input:  s = "Level"
Output: True
Explanation: After lower-casing, "level" reversed is still "level".

Input:  s = "hello"
Output: False

Constraints

• 0 <= len(s) <= 100
• s contains only letters. The empty string counts as a palindrome.

Goals

• Reverse a string with slicing
• Make a comparison case-insensitive with .lower()
• Compare two strings with ==