Draw on Numbers

Hy! Hope you are all doing well. I already ask this question but no one give me any solution. I saw video of Inspecting, Modifying, and Constructing PencilKit Drawings. This video clear my all concepts. But I've one issue I want to draw on numbers like alphabets but there is no numbers file. In this code only uppercase and lowercase drawing file but these files not open. Firstly kindly tell me how to open this file and how to draw on numbers like alphabets. Your solutions are appreciation for me. I am waiting for your solution. Thanks.

Draw on Numbers
 
 
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