input: Write a function to convert degrees Fahrenheit to degrees Celsius. The function should take a temperature in Fahrenheit as input and return the equivalent temperature in Celsius. If the input temperature is below absolute zero (-459.67°F), return "Temperature below absolute zero".
  assert FahrenheitToCelsius(32) == 0
  assert FahrenheitToCelsius(212) == 100
  assert FahrenheitToCelsius(32) == 0
  assert FahrenheitToCelsius(-459.68) == "Temperature below absolute zero"
  assert FahrenheitToCelsius(98.6) == 37.0
output: def FahrenheitToCelsius(fahrenheit):
      if fahrenheit < -459.67:
          return "Temperature below absolute zero"
      return (fahrenheit - 32) * 5 / 9