#!/bin/python3

class BlackBox:
	__listOfValues = None

	def __init__(self, listOfNumbers):
		self.__listOfValues = listOfNumbers
		
	def input(self, listOfNumbers):
		self.__listOfValues += listOfNumbers
	
	def output(self):
		print("Average of list is: ", sum(self.__listOfValues)/ len(self.__listOfValues))

