There is a mute who wants to buy a toothbrush. Imitating the action of brushing one's teeth he successfully expresses himself to the shopkeeper and the purchase is done.
Now if there is a blind man who wishes to buy a pair of sunglasses, how should he express himself?
Think about this before you scroll down for the answer.
He just has to open his mouth and ask, so simple If you got this wrong, please go dig a hole and hide. PS I'm writing this from the hole I had to dig.