Longest Palindrome

Statement

Given a string s that only contains alphabets, return the length of the longest palindrome that may be composed using those letters.

Note: Letters are case-sensitive. Hence, combinations such as “Aa” are not considered palindromes.

Constraints:

• $1 \leq$ s.length $\leq 2000$

• s consists of lowercase and/or uppercase English letters only.

Examples