隐藏的回文串 - 题目

#12208. 隐藏的回文串

统计

本題由以下用戶出題 hos_lyric .

AI Translation — This statement was translated using AI and may contain inaccuracies. Please refer to the original statement if in doubt.

Rabbit 喜欢让字符串变得平衡。给定一个字符串 $S$，它不是回文串。她打算从 $S$ 中删去一些字母，使得剩下的字符串成为一个回文串。

令 $T$ 为删去的字母按其在 $S$ 中的相对顺序连接而成的字符串。编写一个程序，找出字典序最小的 $T$。

输入格式

输入格式如下：

$S$

第一行包含一个字符串 $S$。$S$ 由大写英文字母组成，其长度在 $2$ 到 $100$ 之间（包含 $2$ 和 $100$）。$S$ 不是回文串。

输出格式

你的程序应输出一个字符串：字典序最小的 $T$。

样例

样例输入 1

EXAMPLE

样例输出 1

AMPL

样例输入 2

URTAMMBBTIUT

样例输出 2

RABBIT

样例输入 3

OOOOOOOOOOOOOOQ

样例输出 3

OOOOOOOOOOOOOO

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