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