Score : $200$ points

Problem Statement

You are given a string $s$ consisting of lowercase English letters. Extract all the characters in the odd-indexed positions and print the string obtained by concatenating them. Here, the leftmost character is assigned the index $1$.

Constraints

• Each character in $s$ is a lowercase English letter.
• $1 \leq |s| \leq 10^5$

Input

The input is given from Standard Input in the following format:

$s$

Output

Print the string obtained by concatenating all the characters in the odd-numbered positions.

atcoder

acdr

Extract the first character a, the third character c, the fifth character d and the seventh character r to obtain acdr.

aaaa

aa

z

z

fukuokayamaguchi

fkoaaauh