Can't use mouse or keyboard in game

At the middle of the game, i pressed some random keys by accident. Right after that, I got alt tabbed and when i went back in the game, I was able to move my mouse around, but not use any key or click or anything in game. I tried to disconnect reconnect, same thing happen. I had my basic windows cursor even in game after this happenned. I'm playing in full screen and the only keys that were working were the windows key and the alt+tab combination, anything related to the game wasn't working anymore. The client was still working fine. I just tried a practice tool game and it's still doing the same thing. I'd like some help about it since i can't play league anymore because of this bug. After writing this post I'll reboot my computer and see if it happens again. Thanks for helping [slayer-jinx-catface]