Oh, awful and painful plain text notation. A nice solution to having to type out the whole assignment once it is done would be to

a) develop similar mathematical thinking skills when typing than when writing with pen and paper.

b) have the ability to submit pdf files.

Maybe none is particularly viable at this point, but it would avoid having to spend valuable time in the rote task of copying one's own work into a difficult to read format. Then again, it invites dozens of students to consider what clear, standard notation might look like, perhaps discouraging them from using idiosyncratic, less intelligible notations and handwriting that often characterize mathematical manuscripts.

There isn't much that can be done now, however. For a good reason, too - plain text days in 236 are over. Back to the pen and the paper for the final stretch...