and non of the test cases gave me the answer which is absolutely wonderful.But after reading the comments yes it has to wrap around vertically except when there is the blank space

i think it's better to state explicitly whether it can wrap around vertically and horizontally cuz i find myself having to interpret the test cases to find the answer

does it have to wrap around vertically as well??

yes

yeah hahaha

Meh

To add to pawer13 explanation. When is a function not invertible?? Good luck my dudes