Why randomly some of my letters on keyboard not working

[AC Question]

My phone was perfectly fine I woke up and my whole screen was black it wasn't working anymore which is weird because nothing happend to my phone. I fixed the screen it started working up again now randomly my keyboard, some of the letters are not working and I need it those letters so I can put in the password to my phone. Finger print isn't work either

 

[Javier P]

Duplicate. Please, check your other thread.

http://forums.androidcentral.com/showthread.php?t=691223
Why randomly some of my letters on keyboard not working