Spaces are also characters... 
...and there is one at the end of Line 1 for tha answer,
but not for the output!
(There is not an endline at the end of the files)Spaces are also characters...
...and there is one at the end of Line 1 for tha answer,
but not for the output!
(There is not an endline at the end of the files)
(Note that columns should be counted from 1)
(You should detect the first mistake only)