test.py

from kivy.app import App
from kivy.uix.textinput import TextInput
from kivy.clock import Clock

class Test(App):
    def build(self):
        self.ti = TextInput()
        self.ti.bind(text=self.format)
        return self.ti

    def format(self, *args):
        text = self.ti.text
        if text:
            if text[-1] == 'A':
                self.ti.text = text + '-'
                Clock.schedule_once(self.move_cursor, 1)

    def move_cursor(self, *args):
        print("Moved Cursor")
        self.ti.do_cursor_movement('cursor_right')


Test().run()