optionyes = ["yes", " yes", "yes ", " yes ", "y", " y", "y ", " y "]
optiona = ["a", " a", "a ", " a "]
optionb = ["b", " b", "b ", " b "]
print("=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=")
while True:
	print("\nconvert:")
	print("\nA)Fahrenheit to Celsius \nB)Celsius to Fahrenheit\n\n")
	T = input("Enter option A or B: ")
	if T.lower() in optiona:
		try:
			Q = input("Enter a value in degrees Fahrenheit: ")
			C = round(((float(Q) - 32.0) * (5/9)), 2)
			print("\n" + str(Q) + " degrees Fahrenheit = " + str(C) + " degrees Celsius.\n")
			L = input("Make another calculation? \n(Y/N): ")
			if L.lower() in optionyes:
				continue
			else:
				print("Program terminated.\n=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=")
				break
		except:
			print("\n\nAn error occured.")
	elif T.lower() in optionb:
		try:
			W = input("Enter a value in degrees Celsius: ")
			V = round(((float(W) * (9/5)) + (32.0)), 2)
			print("\n" + str(W) + " degrees Celsius = " + str(V) + " degrees Fahrenheit.\n")
			M = input("Make another calculation? \n(Y/N): ")
			if M.lower() in optionyes:
				continue
			else:
				print("Program terminated.\n=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=")
				break
		except:
			print("An error occured.")
	elif T.lower() == "quit":
		print("\nProgram terminated.\n=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=")
		break
	elif T == "":
		print("\nYou must enter an option before continuing.\n")
	else:
		print("\nunrecognized input\n\n					Try Again!\n")