Score : $100$ points

Problem Statement

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

Print the central character of $S$.

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.

atcoder

o

The central character of atcoder is o.

a

a