What’s wrong with my Python 2 program?

Maybe the problem in on the line print str(lis[j]),, which add a space after the third digit and the site don’t consider this valid, the problem say “with a blank space between each number.” and maybe this is considered invalid.

Another possible solution is to split the list with the X numbers in lists of Y elements and print them with something like print " ".join(lis[Xs:Xf])

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