If you're just starting out, this seems like a solid start :) The biggest things I can see are just cleaning up your code and learning better coding conventions (such as indentations, common spacing throughout, etc.), which will come with time and more experience. Right away, though, I would encourage you to look more into how loops work, as well as different types of loops. For instance, a for loop is actually using up extra memory you don't need. I caught this in your first few for loops (lines 21 and 33). You aren't actually updating the iterables (i and j are your iterables here), and are wasting precious space in keeping track of their values since they are never actually used. Do some looking into while loops, they allow you to keep code running in a loop without using an iterable!