Score : $100$ points

Problem Statement

You are given a string $S$ of even length consisting of lowercase English letters. Let $|S|$ be the length of $S$, and $S_i$ be the $i$-th character of $S$.

Perform the following operation for each $i = 1, 2, \ldots, \frac{|S|}{2}$ in this order, and print the final $S$.

• Swap $S_{2i-1}$ and $S_{2i}$.

Constraints

• $S$ is a string of even length consisting of lowercase English letters.
• The length of $S$ is at most $100$.

Input

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

$S$

Output

Print the answer.

abcdef

badcfe

Initially, $S =$ abcdef. Performing the operation for $i = 1$ swaps $S_1$ and $S_2$, making $S =$ bacdef. Performing the operation for $i = 2$ swaps $S_3$ and $S_4$, making $S =$ badcef. Performing the operation for $i = 3$ swaps $S_5$ and $S_6$, making $S =$ badcfe. Thus, badcfe should be printed.

aaaa

aaaa

atcoderbeginnercontest

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