thank you for your reply :-)

C#. but if the code works fine with 3 or 4 example why shouldn't it work for another examples?

Hi! my code works fine with the Test Cases and when I click on "Run Tests" it passes the tests. but when I try to submit the answer it tells me that the answers are incorrect. what should I do? I checked the program with my own compiler with different strings and it worked fine /o\