import sys, time
import os
from pywinauto import Application

app = Application(backend="win32").start(r"C:\Program Files (x86)\Adobe\Acrobat DC\Acrobat\Acrobat.exe")

time.sleep(10)
print('sleeping over')
Wizard = app['testing.pdf - Adobe Acrobat Pro DC']

Wizard.type_keys("{VK_NEXT}")