a = dict.fromkeys(['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11'], [])
with open('dataset_3380_5.txt', 'r+') as file:
	while True:
		lst = [file.readline().split("\t")[:-2]]
		if lst == []:
			break
		a[lst[0]] += (int(lst[-1]))
	for key in a:
		file.write(key + ' ')
		if a[key]:
			file.write(str(sum(a[key])/len(a[key])) + '\n')
		else:
			file.write('-')
		file.write('\n')