while True:
	print("Options")
	print("Enter 'add' to add two numbers")
	print("Enter 'subtract' to subtract two numbers")
	print("Enter 'divide' to divide two numbers")
	print("Enter 'multiply' to multiply two numbers")
	print("Enter 'quit' to end the program")
	user_input=input(":")
	if user_input=="quit":
		break
	if user_input=="add":
		num1=float(input("Enter a number:"))
		num2=float(input("Enter another number"))
		result=str(num1+num2)
		print ("The answer is "+result)
	elif user_input=="subtract":
		num1=float(input("Enter a number:"))
		num2=float(input("Enter another number"))
		result=str(num1-num2)
		print ("The answer is "+result)
	elif user_input=="divide":
		num1=float(input("Enter a number:"))
		num2=float(input("Enter another number"))
		result=str(num1/num2)
		print ("The answer is "+result)
	elif user_input=="multiply":
		num1=float(input("Enter a number:"))
		num2=float(input("Enter another number"))
		result=str(num1*num2)
		print ("The answer is "+result)
	else:
		print("unknown input")