PROGRAMMING:Reverse concatenation of strings

Connect the reverse and positive order of the string indicated by s to form a new string in the array indicated by T.
###Input format:
Enter a string less than 20 in length on one line. Do not use line breaks, spaces, tabs in strings.
###Output format:
Output the changed string directly.
###Input example:
```in
abc
```
###Output example:
```out
cbaabc
```






answer：If there is no answer, please comment