def compare_l(new, low):
	"""
	Compare the latest temperature with the lowest temperature.
	If lower, replace it. If not, remain the same.

	:param new: Integer, new!=EXIT, The lasted temperature input
	:param low: Integer, high!=EXIT, the lowest temperature of all time
	:return: low
	"""
	if new < low:
		low = new
		return low
	else:
		low += 0
		return low