Write a program called fToC.py that asks the user for a temperature in Fahrenheit and converts it to Celsius.

The lowest possible Fahrenheit temperature is $-459\mathrm{.}67.$ There is no upper limit$.$

If the user enters a Fahrenheit temperature, your program should ask them for an input again. Your program should keep asking until the user enters a temperature greater than or equal to $-459\mathrm{.}67.$ You should use a while loop like we did in Friday's lecture.

You should use functions to organize your code.