Score : $100$ points

问题描述

你将得到一个由小写英文字母组成的奇长度字符串 $S$。

打印出 $S$ 的中心字符。

什么是中心字符？对于一个奇长度字符串 $T$，其中心字符是从起始位置数的第 $\frac{|T|+1}{2}$ 个字符，其中 $|T|$ 表示 $T$ 的长度。

以上为通义千问 qwen-max 翻译，仅供参考。

Problem Statement

You are given an odd-length string $S$ consisting of lowercase English letters.

Print the central character of $S$.

What is the central character? For an odd-length string $T$, its central character is the $\frac{|T|+1}{2}$-th character from the beginning, where $|T|$ is the length of $T$.

Constraints

• $S$ is an odd-length string consisting of lowercase English letters.
• The length of $S$ is between $1$ and $99$ (inclusive).

Input

Input is given from Standard Input in the following format:

$S$

Output

Print the answer.

Sample Input 1

atcoder

Sample Output 1

o

The central character of atcoder is o.

Sample Input 2

a

Sample Output 2

a

update @ 2024/3/10 11:14:15