Palindrome Checker

You are given a string S. Your task is to determine whether the string is a palindrome. A palindrome is a string that reads the same forwards and backwards when case is ignored. Note that no spaces or punctuation are removed; only the case of the characters is ignored.

For example, the string "RaceCar" is considered a palindrome because by ignoring case it becomes "racecar", which is the same forwards and backwards.

Note: An empty string is also considered a palindrome.

The check must be performed solely by converting the string to lower-case and comparing it with its reverse.

inputFormat

The input consists of a single line containing the string S. The string can contain any visible characters. Input is read from standard input.

outputFormat

Output "YES" if the given string is a palindrome (ignoring letter case) and "NO" otherwise. The output should be printed to standard output.

madam

YES