Longest Palindrome Word Length

You are given a string containing words separated by spaces. Your task is to determine the length of the longest word that is a palindrome. A palindrome is a word that reads the same forwards and backwards.

If no palindrome exists in the string, output 0.

The problem can be mathematically expressed as follows:

Let \(W = \{w_1, w_2, \dots, w_n\}\) be the set of words in the input string. Find \(m = \max\{ |w_i| : w_i = reverse(w_i) \}\). If no such word exists, then \(m = 0\).

inputFormat

A single line containing a string composed of words separated by spaces.

outputFormat

A single integer representing the length of the longest palindrome word in the input string. If there is no palindrome word, output 0.## sample

racecar

7