|VK Cup 2015 - Wild Card Round 1|
You are given a string S of even length s 1..s 2n . Perform the following manipulations:
Output the result of these manipulations.
The only line of the input contains a string of lowercase Latin letters. The length of the string is between 2 and 20, inclusive, and it is even.
Output the string which is the result of the described manipulations.