Greetings

Question to those who solves problems on javaScript: there are problems such as 35A that does not use the standard way of I/O through the readline and write / print, and expects that the program to read the file input.txt, and the result to be wrote in the output.txt file. Someone aware of how to make such I/O on the JS?

Examining the global runtime object I found methods read and load and according to their errors they are trying to interact with the file system. But I get failed to make them work. There is also an os object but he seems to be empty. So if anyone has faced this problem — share your experience, please