You are given a string S of even length s 1..s 2n . Perform the following manipulations: divide it into two halves s 1..s n and s n + 1..s 2n reverse each of them s n ..s 1 and s 2n ..s n + 1 concatenate the resulting strings into s n ..s 1 s 2n ..s n + 1 Output the result of these manipulations.

输入描述:

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.

输出描述:

Output the string which is the result of the described manipulations.