Palindrome Checker

You are given a string that may contain letters, digits, spaces, punctuation, and other characters. Your task is to determine whether the string is a palindrome when considering only alphanumeric characters, and ignoring differences in case. In other words, a string is considered a palindrome if it reads the same forwards and backwards after removing all non-alphanumeric characters and converting all letters to lowercase.

For example, the phrase "A man, a plan, a canal, Panama" is a palindrome when ignoring spaces, punctuation, and letter casing.

Note that an empty string or a string with only punctuation is considered a palindrome.

inputFormat

The input consists of a single line containing the string to be checked. The string can include spaces, punctuation, digits, and letters.

outputFormat

Output a single line containing either True if the string is a palindrome or False otherwise.

The output should be written to standard output.

A man, a plan, a canal, Panama

True