Help For AutoGui Loop break

[ahmetnwpal]

from tkinter import *
import pyautogui

a=input("Number : ")
while True:
	pyautogui.write(a, interval=0.5)
     #I want to break this loop from the keyboard.

I want to break this loop from the keyboard.
But when loop started it print a every 0.5 ms. So ı can't use input.
ı just want to break this loop. Not all the program.