Given a large integer, please rotate the whole number by 180o and print out the result.
For example:
However, sometimes after you rotate the number, it becomes meaningless, for example:
Besides, after you rotate the number, if there are some zeros in the front, do not print them out, for example:
The input contains an integer N, which N is no more than 100 digits.
Output the 180 degree rotated number, if the rotated number is meaningless, output "No". Please add a newline at the end of your answer.