Signed in inactive iCloud, can't sign out because I don't know the password
My uncle from USA gave me an iPhone 5s, iOS 12, it has inactive iCloud and FindMyiPhone on. I can't sign out of it because the email doesn't exist, I'm from Macedonia and I don't have anyone from Apple Support which I can contact, except here. Is there any way I can remove the iCloud and add mine and start using the phone as normal ?
iPhone 5s, iOS 12