class Ferry:
	def __init__(self):
		self.heading = 90  # east
		self.pos_north = 0
		self.pos_east = 0

	def load(self, filename):
		with open(filename, "r", encoding="utf-8") as f:
			for line in f:
				data = line.rstrip()
				self.process(data)

	def rotate(self, degrees):
		self.heading += degrees
		while self.heading < 0:
			self.heading += 360
		while self.heading >= 360:
			self.heading -= 360

	def process(self, input):
		command = input[:1]
		value = int(input[1:])

		if command == "N":
			self.pos_north += value
		elif command == "S":
			self.pos_north -= value
		elif command == "E":
			self.pos_east += value
		elif command == "W":
			self.pos_east -= value
		elif command == "L":
			self.rotate(-value)
		elif command == "R":
			self.rotate(value)
		elif command == "F":
			if self.heading == 0:
				self.pos_north += value
			elif self.heading == 90:
				self.pos_east += value
			elif self.heading == 180:
				self.pos_north -= value
			elif self.heading == 270:
				self.pos_east -= value
			else:
				raise Exception(self.heading)
		else:
			raise Exception(command)

		print(input, self.pos_east, self.pos_north)

	def get_md(self):
		return abs(self.pos_east) + abs(self.pos_north)

if __name__ == "__main__":
	f = Ferry()
	f.load("data.txt")
	md = f.get_md()
	print(f"Manhattan distance is {md}")