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题目描述

给出一个只由小写英文字符 $\texttt a,\texttt b,\texttt c,\ldots\texttt y,\texttt z$ 组成的字符串 $S$ ,求 $S$ 中最长回文串的长度 。

字符串长度为 $n$。

输入格式

一行小写英文字符 $\texttt a,\texttt b,\texttt c,\cdots,\texttt y,\texttt z$ 组成的字符串 $S$。

输出格式

一个整数表示答案。

aaa

3

提示

$1\le n\le 1.1\times 10^7$。