As our program is primarily evaluated through automated testing, and students are unable to view the test results, I think it is crucial for the program to be robust rather than relying solely on "common sense." Given that people's opinions and interpretations of common sense can vary greatly, an ambiguous requirement may lead to wasted time as students attempt to decipher and guess at what is expected of their program. Although the Q&A session in the subsequent lectures can to some extent make up for this problem, but it's still a bit unfair for the students started this assignment at the first beginning. Therefore, I sincerely hope the description will be more rigorous and clear.