Why don't I have my keyboard on my Android, anymore?

[AC Question]

I've been disabling some apps on my phone to create more space, so that I could get to my photo gallery (it wouldn't let me go to my photos to delete them, because my phone storage was too full). I don't remember what it was that I disabled. I've looked over all my apps under the "Apps". I've been re-enabling the apps that I thought were the keyboard, but no luck! It worked earlier, until I disabled a few more apps. Now, I don't know what one I disabled... I'm pretty sure that everything else that is disabled has nothing to do with my keyboard; my calendar, calculator, Internet Explorer, stuff like that... Unless I'm skimming over something and missing it, I don't know how to get it back...
I've accidentally done this before, but I managed to get it back by re-enabling an app, but I don't know what it was. HTC something? Even Google something?! I don't know! Any help would be great! Thanks!