Need help- blind typing/touch typing

Hi,
is here anyone who woud be prepared to help me with one task?
For scholl I need to write a program for blind typing. The point is that I'm new in programming and the task seems to hard.

The programm needs to generate a random letter or number, which you need to type back in 15 seconds. If you do not complete the task in that time, your result will not be recorded within results.

Thank you,
Mathias

Please write a plan for your program and present it at the forum. Also investigate some information that might be relevant. Does the program need to speak the character? Do you need a graphical user interface?

For example, search the internet for "python make a random character" or "python time an interval of fifteen seconds".