代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可

@param A string字符串

@return int整型

class Solution:
    def getLongestPalindrome(self , A: str) -> int:
        # write code here
        n = len(A)
        if n==1: return 1
        dp = [1]*n
        for i in range(0, n-1):
            left, right = i, i
            while right<n-1 and A[left] == A[right+1] : right+=1
            while left>=0 and right<n and A[left] == A[right]:
                left -= 1
                right += 1
            dp[i] = right - left - 1
        return max(dp)