Given 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 here.   Constraints: 1 <= s.length <= 2000 s consists of lowercase and/or uppercase English letters only. Function definition for Java:      public int longestPalindrome(String s) {     } Function definition for Python: def longestPalindrome(self, s):   #Your code here Announced Test Cases: Example 1: Input: s = "abccccdd" Output: 7 Explanation: One longest palindrome that can be built is "dccaccd", whose length is 7. Example 2: Input: s = "speediskey" Output: 5 Explanation: The longest palindrome that can be built is "seees", whose length is 5.

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