After Rooting my device,I removed some google's built-in system apps,How do i get them back?

[AC Question]

I use Asus Zenfone 5 running on Android Kitkat 4.4.2. and After rooting it I deleted some google related built-in apps, after which all the remaining google apps stopped functioning(Apps other than google's are working fine).
I don't have a backup,Factory reset didn't work.Is flashing stock ROM my only option?

 

[the tall guy]

Hi, flashing a rom sounds like a good step to take.