Case sensitive slot value input from users

Hello! Is there a way to receive case sensitive input in a slot from users? I acknowledge user would need to type the response instead of saying it. But this is a one time step for new user, so we are considering this option. Alexa is converting the typed input (say ABCxyz90) to small letters (like abcxyz90). We don’t want to convert to upper or lower, we want to get exactly as typed by the user e.g. ABCxyz90.