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.

Input

Input is given from Standard Input in the following format:
S

Output

Print the answer.

Constraints

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

Sample Input 1

atcoder

Sample Output 1

o

The central character of atcoder is o.

Sample Input 2

a

Sample Output 2

a

见题面 Input 部分

见题面 Output 部分