You are given a string S of even length s1..s2n . Perform the following manipulations:

• divide it into two halves s1..sn and sn + 1..s2n
• reverse each of them sn..s1 and s2n..sn + 1
• concatenate the resulting strings into sn..s1s2n..sn + 1

Output the result of these manipulations.

Input

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

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

见题面 Input 部分

见题面 Output 部分