ACM\A\code.txt
...\.\Problem.txt
...\B\code.txt
...\.\Problem.txt
...\C\code.txt
...\.\Problem.txt
...\D\code.txt
...\.\Problem.docx
...\E\code.txt
...\.\Problem.txt
...\A
...\B
...\C
...\D
...\E
ACM