import random

# generate problem
num1 = random.randint(0,9)
num2 = random.randint(0,9)

# enter into an infinite loop
while True:

	# ask the user to answer a math question
	answer = int(input("What is " + str(num1) + " plus " + str(num2) + " ? "))
	
	# did they get it right?
	if answer == num1+num2:

		# congratulate the user
		print ("Correct!")
		
		# end the loop
		break
		
	# did they get it wrong?
	else:
		print ("Incorrect, try again")