joy

def main():
	start = eval(input("Enter starting number of the range:"))
	end = eval(input("Enter ending number of the range:"))

	while((start < 0) or (end < 0) or (start > end)):
    		start = eval(input("Enter starting number of the range:"))
    		end = eval(input("Enter ending number of the range:"))

	max_num = 0
	max_cycle = 0
	cycle = 0
	for n in range(start, end + 1, 1):
		print(n)
		max_num = n
		while (n != 1):
			if (n % 2 == 0):
				n = (n // 2)
				cycle = cycle + 1
			else:
				n = (n * 3) + 1
				cycle = cycle + 1
		if cycle >= max_cycle:
			max_cycle = cycle
			max_num = n
		cycle = 0

	print("The number", max_num, "has the longest cycle length of", max_cycle)


main()