def legal_filename (filnavn):
	alphabet = "abcdefghijklmnopqrstuvwxyzæøå"

	for char in filnavn:
		if char not in alphabet:
			return False

	return True


def write_message (filename):

	filename = open("filnavn.txt", "w")

		while True:
		line = ("Skriv en tekst \n")
		if line == "**":
			break
		print (line + "\n")

	filename.close ()


def main ():

	filnavn = ("Skriv et filnavn\n")

	legal_filename (filnavn)

	filename = (filnavn + ".txt")

	write_message (filename)


if __name__ == "__main__":
	main ()