100721: [AtCoder]ABC072 B - OddString

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.
• $1≤|s|≤10^5$

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.

Sample Input 1

atcoder

Sample Output 1

acdr

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

Sample Input 2

aaaa

Sample Output 2

aa

Sample Input 3

z

Sample Output 3

z

Sample Input 4

fukuokayamaguchi

Sample Output 4

fkoaaauh