Forgot My Locker Combo Again Today

So today I forgot my locker combo AGAIN. It’s not like I never had it before, but you know how these things go, right? So I walked up to Mr. Thompson thinking he’d let me in for the 50th time or whatever. But guess what? He actually asked me why I was always forgetting it and stuff. He said it looked like I was trying to get into a bank vault every day instead of just opening a locker. I was like, ‘Well, my locker is super important!’ Then he goes and makes this big deal about how I need to write the combo somewhere safe or something. But honestly, I have no idea where else to put it. My planner? No way that’s going to stay safe there. And writing it on a piece of paper in my backpack seems dangerous too, because what if someone finds it and tries to steal into my locker stuff or worse? Anyway, Mr. Thompson gave me some weird advice about using a code instead of an actual number combo. But I feel like that’s just going to make things more confusing. So here we are, stuck in this endless loop of locker misery. Anyone else out there got any good ideas?