One test case not passing

please help with one test case

@chemant077 Please provide your code in Coding blocks IDE.

@chemant077 Just one small hint, you need to read n as number and M as string.
Then you will need to take mod of M under n, then take simple GCD of the so obtained number.
If this resolves your doubt mark it as resolved.

I hope I’ve cleared your doubt. I ask you to please rate your experience here
Your feedback is very important. It helps us improve our platform and hence provide you
the learning experience you deserve.

On the off chance, you still have some questions or not find the answers satisfactory, you may reopen
the doubt.