The authors should've mentioned these in the question. Like if q is 0 then you should print 10 but if it is any number between 1 to 9 then you should print that number only, i.e. 2 for 2, 4 for 4 not 14 for 4.

Thanks, that saved me a lot of time. I was printing 0 for 0. Which makes sense in my opinion.

thanks to you .It was really helpful