soru 2-2

with open("sample_prices.txt", "r") as myfile:
	all = myfile.readlines()

prices = [ ]
for line in all:
	l = line.split(":")
	prices.append( (l[0], l[1] ))

counter = 1
memory = [prices[0][0]]
current_price = prices[0][1]
for p in prices[1:]:
	if p[1] == current_price:
		counter += 1
		if counter < 3:
			memory.append(p[0])
		elif counter == 3:
			print()
			for m in memory:
				print(m)
			print(p[0])
		elif counter > 3:
			print(p[0])
	else:
		memory = [p[0]]
		counter = 1
		current_price = p[1]