I was solving 408B and it was easy. I submitted the code and I get WA in test 15. Then I have revised the code and changed the arrays' size from 1000 to 1005 and it worked! In the problem maximum length of both strings is 1000. why did that happen? first submission WA on test 15 : 28983405. second submission Accepted : 28983523

please do not down vote before telling me what is the wring in my question