This is a "typewriter mystery" revisited which appeared in ETCetera magazine back in 1988. This is fun and easy to do. You get the instructions in form of a numbered sequence of blanks and letters for each line, e.g. line 1 - 23sp, 1$. In this case you press the space bar 23 times, and then type "$" once. My Hermes is not equipped with the $-sign, so I used a capital "M", but I guess it came out good as well.
As you see, the mystery is already revealed at this point, but this is just to encourage you guys to also have fun an solve another one - there is more in ETCetera issues of this period.