How do you get the value of what the user has drawn to the canvas?

I'm planning to make a basic app for my school project. I'm a newbie to MIT app inventor and block coding in general.

So, the app is basically a basic math questions with randomly generated operands and the operator depends on what the user wants.

What I wanted to do is basically use the canvas to be where the user will write/draw their answers to, get the value of what the user wrote/drew, and compare it to the answer to the question.

Is the idea possible? I hope that I explained well enough at least.

I got the canvas thingy idea on a game called Divineko.

Thank you for answering!

For a newbie, start with a textbox for the input. After that works, leave the complications for a separate project.

This is too hard for a newbie.

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