direction = ("")
last_dir = ("")

def battle():
	print("battle begins")

while direction.upper() != ("S"):
	direction = input("Which way? ")

	if direction.upper() == ("N") and last_dir.upper() != ("N") and last_dir.upper() != ("E") and last_dir.upper() != ("W"):
		print("You go North and come back")
		last_dir = direction
	elif direction.upper() == ("E") and last_dir.upper() != ("E"):
		print("You go East and come back")
		last_dir = direction
	elif direction.upper() == ("W") and last_dir.upper() != ("W"):
		print("You go West and come back")
		last_dir = direction
	elif direction.upper() == ("S"):
		battle()
	else:
		print("You already went that way! You stay put.")