409. Longest PalindromeEasyGiven a string s which consists of lowercase or uppercase letters, return the length of the longest palindrome that can be built with those letters.Letters are case sensitive, for example, "Aa" is not considered a palindrome.Example 1:Input: s = "abccccdd"Output: 7Explanation: One longest palindrome that can be built is "dccaccd", whose length is 7.Example 2:Input: s =..